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<url><loc>https://www.htpu.net/mathlet/f/nucleosome</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/nucleosome"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/nucleosome?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/nucleosome?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/nucleosome"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/lyapunov-fractal</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/lyapunov-fractal"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/lyapunov-fractal?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/lyapunov-fractal?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/lyapunov-fractal"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mandelbar</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mandelbar"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mandelbar?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mandelbar?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mandelbar"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mandelbox</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mandelbox"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mandelbox?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mandelbox?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mandelbox"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mandelbrot</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mandelbrot"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mandelbrot?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mandelbrot?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mandelbrot"/></url>
<url><loc>https://www.htpu.net/mathlet/f/menger-sponge-2d</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/menger-sponge-2d"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/menger-sponge-2d?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/menger-sponge-2d?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/menger-sponge-2d"/></url>
<url><loc>https://www.htpu.net/mathlet/f/minkowski-sausage</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/minkowski-sausage"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/minkowski-sausage?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/minkowski-sausage?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/minkowski-sausage"/></url>
<url><loc>https://www.htpu.net/mathlet/f/multibrot-cubic</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/multibrot-cubic"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/multibrot-cubic?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/multibrot-cubic?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/multibrot-cubic"/></url>
<url><loc>https://www.htpu.net/mathlet/f/multibrot</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/multibrot"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/multibrot?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/multibrot?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/multibrot"/></url>
<url><loc>https://www.htpu.net/mathlet/f/newton-fractal</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/newton-fractal"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/newton-fractal?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/newton-fractal?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/newton-fractal"/></url>
<url><loc>https://www.htpu.net/mathlet/f/nova-fractal</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/nova-fractal"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/nova-fractal?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/nova-fractal?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/nova-fractal"/></url>
<url><loc>https://www.htpu.net/mathlet/f/peano-curve</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/peano-curve"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/peano-curve?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/peano-curve?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/peano-curve"/></url>
<url><loc>https://www.htpu.net/mathlet/f/perlin-noise</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/perlin-noise"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/perlin-noise?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/perlin-noise?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/perlin-noise"/></url>
<url><loc>https://www.htpu.net/mathlet/f/phoenix-fractal</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/phoenix-fractal"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/phoenix-fractal?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/phoenix-fractal?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/phoenix-fractal"/></url>
<url><loc>https://www.htpu.net/mathlet/f/pythagoras-tree</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/pythagoras-tree"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/pythagoras-tree?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/pythagoras-tree?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/pythagoras-tree"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sierpinski-arrowhead</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sierpinski-arrowhead"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sierpinski-arrowhead?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sierpinski-arrowhead?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sierpinski-arrowhead"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sierpinski-carpet</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sierpinski-carpet"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sierpinski-carpet?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sierpinski-carpet?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sierpinski-carpet"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sierpinski-triangle</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sierpinski-triangle"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sierpinski-triangle?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sierpinski-triangle?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sierpinski-triangle"/></url>
<url><loc>https://www.htpu.net/mathlet/f/strange-attractor</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/strange-attractor"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/strange-attractor?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/strange-attractor?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/strange-attractor"/></url>
<url><loc>https://www.htpu.net/mathlet/f/takagi-blancmange</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/takagi-blancmange"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/takagi-blancmange?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/takagi-blancmange?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/takagi-blancmange"/></url>
<url><loc>https://www.htpu.net/mathlet/f/terdragon</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/terdragon"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/terdragon?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/terdragon?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/terdragon"/></url>
<url><loc>https://www.htpu.net/mathlet/f/tricorn</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/tricorn"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/tricorn?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/tricorn?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/tricorn"/></url>
<url><loc>https://www.htpu.net/mathlet/f/weierstrass-curve</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/weierstrass-curve"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/weierstrass-curve?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/weierstrass-curve?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/weierstrass-curve"/></url>
<url><loc>https://www.htpu.net/mathlet/f/hawk-dove-replicator</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/hawk-dove-replicator"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/hawk-dove-replicator?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/hawk-dove-replicator?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/hawk-dove-replicator"/></url>
<url><loc>https://www.htpu.net/mathlet/f/nash-bargain</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/nash-bargain"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/nash-bargain?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/nash-bargain?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/nash-bargain"/></url>
<url><loc>https://www.htpu.net/mathlet/f/prisoners-dilemma</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/prisoners-dilemma"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/prisoners-dilemma?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/prisoners-dilemma?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/prisoners-dilemma"/></url>
<url><loc>https://www.htpu.net/mathlet/f/bezier</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/bezier"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/bezier?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/bezier?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/bezier"/></url>
<url><loc>https://www.htpu.net/mathlet/f/cassini-oval</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/cassini-oval"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/cassini-oval?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/cassini-oval?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/cassini-oval"/></url>
<url><loc>https://www.htpu.net/mathlet/f/centroid-triangle</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/centroid-triangle"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/centroid-triangle?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/centroid-triangle?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/centroid-triangle"/></url>
<url><loc>https://www.htpu.net/mathlet/f/circle-inversion</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/circle-inversion"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/circle-inversion?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/circle-inversion?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/circle-inversion"/></url>
<url><loc>https://www.htpu.net/mathlet/f/circle-pack</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/circle-pack"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/circle-pack?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/circle-pack?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/circle-pack"/></url>
<url><loc>https://www.htpu.net/mathlet/f/cissoid</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/cissoid"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/cissoid?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/cissoid?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/cissoid"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/cycloid-anim</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/cycloid-anim"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/cycloid-anim?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/cycloid-anim?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/cycloid-anim"/></url>
<url><loc>https://www.htpu.net/mathlet/f/distance-point-line</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/distance-point-line"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/distance-point-line?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/distance-point-line?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/distance-point-line"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/string-mode</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/string-mode"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/string-mode?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/string-mode?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/string-mode"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/wood-air-resonance</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/wood-air-resonance"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/wood-air-resonance?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/wood-air-resonance?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/wood-air-resonance"/></url>
<url><loc>https://www.htpu.net/mathlet/f/abundance</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/abundance"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/abundance?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/abundance?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/abundance"/></url>
<url><loc>https://www.htpu.net/mathlet/f/collatz</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/collatz"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/collatz?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/collatz?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/collatz"/></url>
<url><loc>https://www.htpu.net/mathlet/f/continued-fractions</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/continued-fractions"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/continued-fractions?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/continued-fractions?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/continued-fractions"/></url>
<url><loc>https://www.htpu.net/mathlet/f/digital-root</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/digital-root"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/digital-root?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/digital-root?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/digital-root"/></url>
<url><loc>https://www.htpu.net/mathlet/f/divisor-tau</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/divisor-tau"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/divisor-tau?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/divisor-tau?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/divisor-tau"/></url>
<url><loc>https://www.htpu.net/mathlet/f/divisors-plot</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/divisors-plot"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/divisors-plot?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/divisors-plot?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/divisors-plot"/></url>
<url><loc>https://www.htpu.net/mathlet/f/euclid-algorithm</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/euclid-algorithm"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/euclid-algorithm?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/euclid-algorithm?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/euclid-algorithm"/></url>
<url><loc>https://www.htpu.net/mathlet/f/farey-sequence</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/farey-sequence"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/farey-sequence?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/farey-sequence?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/farey-sequence"/></url>
<url><loc>https://www.htpu.net/mathlet/f/fibonacci-spiral</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/fibonacci-spiral"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/fibonacci-spiral?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/fibonacci-spiral?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/fibonacci-spiral"/></url>
<url><loc>https://www.htpu.net/mathlet/f/gauss-circle</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/gauss-circle"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/gauss-circle?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/gauss-circle?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/gauss-circle"/></url>
<url><loc>https://www.htpu.net/mathlet/f/goldbach</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/goldbach"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/goldbach?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/goldbach?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/goldbach"/></url>
<url><loc>https://www.htpu.net/mathlet/f/liouville-lambda</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/liouville-lambda"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/liouville-lambda?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/liouville-lambda?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/liouville-lambda"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mersenne-primes</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mersenne-primes"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mersenne-primes?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mersenne-primes?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mersenne-primes"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mertens-prime-harmonic</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mertens-prime-harmonic"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mertens-prime-harmonic?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mertens-prime-harmonic?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mertens-prime-harmonic"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mobius-mu</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mobius-mu"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mobius-mu?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mobius-mu?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mobius-mu"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mod-mult-circle</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mod-mult-circle"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mod-mult-circle?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mod-mult-circle?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mod-mult-circle"/></url>
<url><loc>https://www.htpu.net/mathlet/f/omega-prime-count</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/omega-prime-count"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/omega-prime-count?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/omega-prime-count?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/omega-prime-count"/></url>
<url><loc>https://www.htpu.net/mathlet/f/pellet-fibonacci</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/pellet-fibonacci"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/pellet-fibonacci?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/pellet-fibonacci?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/pellet-fibonacci"/></url>
<url><loc>https://www.htpu.net/mathlet/f/perfect-numbers</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/perfect-numbers"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/perfect-numbers?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/perfect-numbers?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/perfect-numbers"/></url>
<url><loc>https://www.htpu.net/mathlet/f/prime-counting</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/prime-counting"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/prime-counting?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/prime-counting?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/prime-counting"/></url>
<url><loc>https://www.htpu.net/mathlet/f/pythagorean-triples</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/pythagorean-triples"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/pythagorean-triples?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/pythagorean-triples?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/pythagorean-triples"/></url>
<url><loc>https://www.htpu.net/mathlet/f/quadratic-residues</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/quadratic-residues"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/quadratic-residues?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/quadratic-residues?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/quadratic-residues"/></url>
<url><loc>https://www.htpu.net/mathlet/f/recaman-sequence</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/recaman-sequence"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/recaman-sequence?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/recaman-sequence?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/recaman-sequence"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sieve</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sieve"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sieve?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sieve?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sieve"/></url>
<url><loc>https://www.htpu.net/mathlet/f/stern-brocot</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/stern-brocot"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/stern-brocot?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/stern-brocot?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/stern-brocot"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sum-square-roots</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sum-square-roots"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sum-square-roots?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sum-square-roots?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sum-square-roots"/></url>
<url><loc>https://www.htpu.net/mathlet/f/totient-mod</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/totient-mod"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/totient-mod?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/totient-mod?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/totient-mod"/></url>
<url><loc>https://www.htpu.net/mathlet/f/totient-summatory</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/totient-summatory"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/totient-summatory?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/totient-summatory?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/totient-summatory"/></url>
<url><loc>https://www.htpu.net/mathlet/f/triangular-numbers</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/triangular-numbers"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/triangular-numbers?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/triangular-numbers?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/triangular-numbers"/></url>
<url><loc>https://www.htpu.net/mathlet/f/twin-primes</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/twin-primes"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/twin-primes?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/twin-primes?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/twin-primes"/></url>
<url><loc>https://www.htpu.net/mathlet/f/ulam-spiral</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/ulam-spiral"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/ulam-spiral?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/ulam-spiral?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/ulam-spiral"/></url>
<url><loc>https://www.htpu.net/mathlet/f/zeta-zeros</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/zeta-zeros"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/zeta-zeros?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/zeta-zeros?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/zeta-zeros"/></url>
<url><loc>https://www.htpu.net/mathlet/f/bifurcation</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/bifurcation"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/bifurcation?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/bifurcation?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/bifurcation"/></url>
<url><loc>https://www.htpu.net/mathlet/f/brusselator</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/brusselator"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/brusselator?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/brusselator?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/brusselator"/></url>
<url><loc>https://www.htpu.net/mathlet/f/chen-attractor</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/chen-attractor"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/chen-attractor?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/chen-attractor?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/chen-attractor"/></url>
<url><loc>https://www.htpu.net/mathlet/f/circular-restricted</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/circular-restricted"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/circular-restricted?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/circular-restricted?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/circular-restricted"/></url>
<url><loc>https://www.htpu.net/mathlet/f/dadras-attractor</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/dadras-attractor"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/dadras-attractor?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/dadras-attractor?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/dadras-attractor"/></url>
<url><loc>https://www.htpu.net/mathlet/f/double-pendulum</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/double-pendulum"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/double-pendulum?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/double-pendulum?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/double-pendulum"/></url>
<url><loc>https://www.htpu.net/mathlet/f/duffing</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/duffing"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/duffing?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/duffing?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/duffing"/></url>
<url><loc>https://www.htpu.net/mathlet/f/euler-method</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/euler-method"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/euler-method?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/euler-method?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/euler-method"/></url>
<url><loc>https://www.htpu.net/mathlet/f/forced-pendulum</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/forced-pendulum"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/forced-pendulum?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/forced-pendulum?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/forced-pendulum"/></url>
<url><loc>https://www.htpu.net/mathlet/f/four-wing</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/four-wing"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/four-wing?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/four-wing?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/four-wing"/></url>
<url><loc>https://www.htpu.net/mathlet/f/halvorsen</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/halvorsen"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/halvorsen?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/halvorsen?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/halvorsen"/></url>
<url><loc>https://www.htpu.net/mathlet/f/kuramoto</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/kuramoto"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/kuramoto?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/kuramoto?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/kuramoto"/></url>
<url><loc>https://www.htpu.net/mathlet/f/limit-cycle</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/limit-cycle"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/limit-cycle?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/limit-cycle?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/limit-cycle"/></url>
<url><loc>https://www.htpu.net/mathlet/f/lorenz-96</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/lorenz-96"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/lorenz-96?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/lorenz-96?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/lorenz-96"/></url>
<url><loc>https://www.htpu.net/mathlet/f/lorenz</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/lorenz"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/lorenz?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/lorenz?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/lorenz"/></url>
<url><loc>https://www.htpu.net/mathlet/f/lotka-volterra</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/lotka-volterra"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/lotka-volterra?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/lotka-volterra?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/lotka-volterra"/></url>
<url><loc>https://www.htpu.net/mathlet/f/lyapunov-exp</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/lyapunov-exp"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/lyapunov-exp?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/lyapunov-exp?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/lyapunov-exp"/></url>
<url><loc>https://www.htpu.net/mathlet/f/oscillator-coupled</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/oscillator-coupled"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/oscillator-coupled?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/oscillator-coupled?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/oscillator-coupled"/></url>
<url><loc>https://www.htpu.net/mathlet/f/pendulum</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/pendulum"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/pendulum?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/pendulum?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/pendulum"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/predator-prey-3</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/predator-prey-3"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/predator-prey-3?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/predator-prey-3?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/predator-prey-3"/></url>
<url><loc>https://www.htpu.net/mathlet/f/predator-three</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/predator-three"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/predator-three?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/predator-three?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/predator-three"/></url>
<url><loc>https://www.htpu.net/mathlet/f/relaxation</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/relaxation"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/relaxation?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/relaxation?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/relaxation"/></url>
<url><loc>https://www.htpu.net/mathlet/f/rossler</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/rossler"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/rossler?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/rossler?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/rossler"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sine-gordon</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sine-gordon"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sine-gordon?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sine-gordon?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sine-gordon"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sir-epidemic</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sir-epidemic"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sir-epidemic?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sir-epidemic?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sir-epidemic"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sirs</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sirs"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sirs?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sirs?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sirs"/></url>
<url><loc>https://www.htpu.net/mathlet/f/spring-mass</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/spring-mass"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/spring-mass?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/spring-mass?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/spring-mass"/></url>
<url><loc>https://www.htpu.net/mathlet/f/thomas-attractor</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/thomas-attractor"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/thomas-attractor?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/thomas-attractor?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/thomas-attractor"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/ackley</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/ackley"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/ackley?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/ackley?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/ackley"/></url>
<url><loc>https://www.htpu.net/mathlet/f/adam-bias</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/adam-bias"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/adam-bias?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/adam-bias?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/adam-bias"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/armijo-condition</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/armijo-condition"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/armijo-condition?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/armijo-condition?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/armijo-condition"/></url>
<url><loc>https://www.htpu.net/mathlet/f/conjugate-gradient</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/conjugate-gradient"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/conjugate-gradient?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/conjugate-gradient?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/conjugate-gradient"/></url>
<url><loc>https://www.htpu.net/mathlet/f/coordinate-descent</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/coordinate-descent"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/coordinate-descent?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/coordinate-descent?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/coordinate-descent"/></url>
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<url><loc>https://www.htpu.net/mathlet/f/rydberg-formula</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/rydberg-formula"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/rydberg-formula?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/rydberg-formula?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/rydberg-formula"/></url>
<url><loc>https://www.htpu.net/mathlet/f/spin-half</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/spin-half"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/spin-half?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/spin-half?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/spin-half"/></url>
<url><loc>https://www.htpu.net/mathlet/f/spontaneous-emission</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/spontaneous-emission"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/spontaneous-emission?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/spontaneous-emission?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/spontaneous-emission"/></url>
<url><loc>https://www.htpu.net/mathlet/f/stern-gerlach</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/stern-gerlach"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/stern-gerlach?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/stern-gerlach?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/stern-gerlach"/></url>
<url><loc>https://www.htpu.net/mathlet/f/wkb-tunneling</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/wkb-tunneling"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/wkb-tunneling?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/wkb-tunneling?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/wkb-tunneling"/></url>
<url><loc>https://www.htpu.net/mathlet/f/zeeman-splitting</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/zeeman-splitting"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/zeeman-splitting?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/zeeman-splitting?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/zeeman-splitting"/></url>
<url><loc>https://www.htpu.net/mathlet/f/aliasing-2d</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/aliasing-2d"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/aliasing-2d?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/aliasing-2d?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/aliasing-2d"/></url>
<url><loc>https://www.htpu.net/mathlet/f/am-modulation</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/am-modulation"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/am-modulation?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/am-modulation?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/am-modulation"/></url>
<url><loc>https://www.htpu.net/mathlet/f/beat-pattern</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/beat-pattern"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/beat-pattern?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/beat-pattern?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/beat-pattern"/></url>
<url><loc>https://www.htpu.net/mathlet/f/biquad</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/biquad"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/biquad?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/biquad?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/biquad"/></url>
<url><loc>https://www.htpu.net/mathlet/f/cepstrum</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/cepstrum"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/cepstrum?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/cepstrum?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/cepstrum"/></url>
<url><loc>https://www.htpu.net/mathlet/f/convolution</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/convolution"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/convolution?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/convolution?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/convolution"/></url>
<url><loc>https://www.htpu.net/mathlet/f/correlogram</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/correlogram"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/correlogram?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/correlogram?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/correlogram"/></url>
<url><loc>https://www.htpu.net/mathlet/f/dct</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/dct"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/dct?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/dct?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/dct"/></url>
<url><loc>https://www.htpu.net/mathlet/f/decibel</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/decibel"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/decibel?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/decibel?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/decibel"/></url>
<url><loc>https://www.htpu.net/mathlet/f/dft</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/dft"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/dft?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/dft?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/dft"/></url>
<url><loc>https://www.htpu.net/mathlet/f/fft</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/fft"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/fft?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/fft?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/fft"/></url>
<url><loc>https://www.htpu.net/mathlet/f/fm-modulation</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/fm-modulation"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/fm-modulation?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/fm-modulation?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/fm-modulation"/></url>
<url><loc>https://www.htpu.net/mathlet/f/group-delay</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/group-delay"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/group-delay?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/group-delay?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/group-delay"/></url>
<url><loc>https://www.htpu.net/mathlet/f/hilbert-transform</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/hilbert-transform"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/hilbert-transform?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/hilbert-transform?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/hilbert-transform"/></url>
<url><loc>https://www.htpu.net/mathlet/f/iir-resonator</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/iir-resonator"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/iir-resonator?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/iir-resonator?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/iir-resonator"/></url>
<url><loc>https://www.htpu.net/mathlet/f/lissajous</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/lissajous"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/lissajous?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/lissajous?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/lissajous"/></url>
<url><loc>https://www.htpu.net/mathlet/f/lowpass-filter</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/lowpass-filter"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/lowpass-filter?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/lowpass-filter?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/lowpass-filter"/></url>
<url><loc>https://www.htpu.net/mathlet/f/morlet-wavelet</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/morlet-wavelet"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/morlet-wavelet?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/morlet-wavelet?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/morlet-wavelet"/></url>
<url><loc>https://www.htpu.net/mathlet/f/notch-filter</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/notch-filter"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/notch-filter?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/notch-filter?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/notch-filter"/></url>
<url><loc>https://www.htpu.net/mathlet/f/poles-zeros</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/poles-zeros"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/poles-zeros?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/poles-zeros?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/poles-zeros"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sampling-aliasing</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sampling-aliasing"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sampling-aliasing?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sampling-aliasing?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sampling-aliasing"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sinc</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sinc"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sinc?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sinc?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sinc"/></url>
<url><loc>https://www.htpu.net/mathlet/f/spectrogram</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/spectrogram"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/spectrogram?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/spectrogram?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/spectrogram"/></url>
<url><loc>https://www.htpu.net/mathlet/f/upsampling</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/upsampling"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/upsampling?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/upsampling?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/upsampling"/></url>
<url><loc>https://www.htpu.net/mathlet/f/wavelet-haar</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/wavelet-haar"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/wavelet-haar?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/wavelet-haar?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/wavelet-haar"/></url>
<url><loc>https://www.htpu.net/mathlet/f/wavelet-mexican</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/wavelet-mexican"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/wavelet-mexican?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/wavelet-mexican?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/wavelet-mexican"/></url>
<url><loc>https://www.htpu.net/mathlet/f/window-functions</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/window-functions"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/window-functions?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/window-functions?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/window-functions"/></url>
<url><loc>https://www.htpu.net/mathlet/f/zero-crossing</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/zero-crossing"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/zero-crossing?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/zero-crossing?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/zero-crossing"/></url>
<url><loc>https://www.htpu.net/mathlet/f/zeropad-fft</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/zeropad-fft"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/zeropad-fft?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/zeropad-fft?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/zeropad-fft"/></url>
<url><loc>https://www.htpu.net/mathlet/f/zoom-fft</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/zoom-fft"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/zoom-fft?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/zoom-fft?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/zoom-fft"/></url>
<url><loc>https://www.htpu.net/mathlet/f/ising-mft</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/ising-mft"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/ising-mft?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/ising-mft?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/ising-mft"/></url>
<url><loc>https://www.htpu.net/mathlet/f/schottky-anomaly</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/schottky-anomaly"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/schottky-anomaly?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/schottky-anomaly?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/schottky-anomaly"/></url>
<url><loc>https://www.htpu.net/mathlet/f/two-level-partition</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/two-level-partition"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/two-level-partition?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/two-level-partition?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/two-level-partition"/></url>
<url><loc>https://www.htpu.net/mathlet/f/bohemian-dome</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/bohemian-dome"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/bohemian-dome?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/bohemian-dome?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/bohemian-dome"/></url>
<url><loc>https://www.htpu.net/mathlet/f/bottle-coffee</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/bottle-coffee"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/bottle-coffee?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/bottle-coffee?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/bottle-coffee"/></url>
<url><loc>https://www.htpu.net/mathlet/f/breather-surface</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/breather-surface"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/breather-surface?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/breather-surface?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/breather-surface"/></url>
<url><loc>https://www.htpu.net/mathlet/f/catenoid</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/catenoid"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/catenoid?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/catenoid?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/catenoid"/></url>
<url><loc>https://www.htpu.net/mathlet/f/cone-3d</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/cone-3d"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/cone-3d?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/cone-3d?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/cone-3d"/></url>
<url><loc>https://www.htpu.net/mathlet/f/conway-knots</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/conway-knots"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/conway-knots?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/conway-knots?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/conway-knots"/></url>
<url><loc>https://www.htpu.net/mathlet/f/cross-cap</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/cross-cap"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/cross-cap?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/cross-cap?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/cross-cap"/></url>
<url><loc>https://www.htpu.net/mathlet/f/cw-cells-betti</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/cw-cells-betti"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/cw-cells-betti?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/cw-cells-betti?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/cw-cells-betti"/></url>
<url><loc>https://www.htpu.net/mathlet/f/dini-surface</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/dini-surface"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/dini-surface?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/dini-surface?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/dini-surface"/></url>
<url><loc>https://www.htpu.net/mathlet/f/enneper</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/enneper"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/enneper?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/enneper?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/enneper"/></url>
<url><loc>https://www.htpu.net/mathlet/f/euler-characteristic</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/euler-characteristic"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/euler-characteristic?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/euler-characteristic?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/euler-characteristic"/></url>
<url><loc>https://www.htpu.net/mathlet/f/euler-genus-orientable</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/euler-genus-orientable"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/euler-genus-orientable?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/euler-genus-orientable?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/euler-genus-orientable"/></url>
<url><loc>https://www.htpu.net/mathlet/f/genus-surface</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/genus-surface"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/genus-surface?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/genus-surface?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/genus-surface"/></url>
<url><loc>https://www.htpu.net/mathlet/f/heart-3d</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/heart-3d"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/heart-3d?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/heart-3d?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/heart-3d"/></url>
<url><loc>https://www.htpu.net/mathlet/f/helicoid</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/helicoid"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/helicoid?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/helicoid?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/helicoid"/></url>
<url><loc>https://www.htpu.net/mathlet/f/hopf-fibration</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/hopf-fibration"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/hopf-fibration?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/hopf-fibration?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/hopf-fibration"/></url>
<url><loc>https://www.htpu.net/mathlet/f/hyperboloid</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/hyperboloid"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/hyperboloid?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/hyperboloid?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/hyperboloid"/></url>
<url><loc>https://www.htpu.net/mathlet/f/klein-bottle</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/klein-bottle"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/klein-bottle?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/klein-bottle?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/klein-bottle"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mapping-class-dim</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mapping-class-dim"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mapping-class-dim?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mapping-class-dim?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mapping-class-dim"/></url>
<url><loc>https://www.htpu.net/mathlet/f/mobius</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/mobius"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/mobius?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/mobius?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/mobius"/></url>
<url><loc>https://www.htpu.net/mathlet/f/orientability-test</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/orientability-test"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/orientability-test?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/orientability-test?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/orientability-test"/></url>
<url><loc>https://www.htpu.net/mathlet/f/paraboloid</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/paraboloid"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/paraboloid?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/paraboloid?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/paraboloid"/></url>
<url><loc>https://www.htpu.net/mathlet/f/plucker-genus</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/plucker-genus"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/plucker-genus?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/plucker-genus?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/plucker-genus"/></url>
<url><loc>https://www.htpu.net/mathlet/f/projective-plane</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/projective-plane"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/projective-plane?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/projective-plane?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/projective-plane"/></url>
<url><loc>https://www.htpu.net/mathlet/f/saddle-surface</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/saddle-surface"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/saddle-surface?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/saddle-surface?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/saddle-surface"/></url>
<url><loc>https://www.htpu.net/mathlet/f/seashell</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/seashell"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/seashell?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/seashell?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/seashell"/></url>
<url><loc>https://www.htpu.net/mathlet/f/seifert-genus-bound</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/seifert-genus-bound"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/seifert-genus-bound?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/seifert-genus-bound?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/seifert-genus-bound"/></url>
<url><loc>https://www.htpu.net/mathlet/f/sphere</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/sphere"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/sphere?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/sphere?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/sphere"/></url>
<url><loc>https://www.htpu.net/mathlet/f/spherical-harmonics</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/spherical-harmonics"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/spherical-harmonics?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/spherical-harmonics?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/spherical-harmonics"/></url>
<url><loc>https://www.htpu.net/mathlet/f/superegg</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/superegg"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/superegg?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/superegg?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/superegg"/></url>
<url><loc>https://www.htpu.net/mathlet/f/torus</loc><lastmod>2026-05-09</lastmod><changefreq>monthly</changefreq><priority>0.8</priority><xhtml:link rel="alternate" hreflang="zh-CN" href="https://www.htpu.net/mathlet/f/torus"/><xhtml:link rel="alternate" hreflang="en" href="https://www.htpu.net/mathlet/f/torus?lang=en"/><xhtml:link rel="alternate" hreflang="es" href="https://www.htpu.net/mathlet/f/torus?lang=es"/><xhtml:link rel="alternate" hreflang="x-default" href="https://www.htpu.net/mathlet/f/torus"/></url>
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