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#geometry

12 posts11 participants0 posts today
Nicholas<p><span class="h-card" translate="no"><a href="https://mathstodon.xyz/@benleis" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>benleis</span></a></span> Here is a visual proof of Ptolemy's theorem I just draw.</p><p><a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/maths" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>maths</span></a> <a href="https://mathstodon.xyz/tags/proofs" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>proofs</span></a></p>
SwindlerOfInsanity<p>How many edges does a circle have?<br><a href="https://mastodon.social/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a></p>
Christian Guerrero<a href="https://pixelfed.social/discover/tags/architecture?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#architecture</a> <a href="https://pixelfed.social/discover/tags/modernism?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#modernism</a> <a href="https://pixelfed.social/discover/tags/design?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#design</a> <a href="https://pixelfed.social/discover/tags/structure?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#structure</a> <a href="https://pixelfed.social/discover/tags/urban?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#urban</a> <a href="https://pixelfed.social/discover/tags/geometry?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#geometry</a> <a href="https://pixelfed.social/discover/tags/minimalism?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#minimalism</a> <a href="https://pixelfed.social/discover/tags/skyscraper?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#skyscraper</a> <a href="https://pixelfed.social/discover/tags/facade?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#facade</a> <a href="https://pixelfed.social/discover/tags/perspective?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#perspective</a> <a href="https://pixelfed.social/discover/tags/innovation?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#innovation</a>
Sci-books.com<p>Symplectic Geometry and Fourier Analysis: Second Edition (Dover Books on Mathematics) by Nolan R. Wallach (PDF)<br>Author: Nolan R. Wallach<br>File Type: PDF<br>Download at <a href="https://sci-books.com/symplectic-geometry-and-fourier-analysis-second-edition-dover-books-on-mathematics-b07b6l4kgp/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">sci-books.com/symplectic-geome</span><span class="invisible">try-and-fourier-analysis-second-edition-dover-books-on-mathematics-b07b6l4kgp/</span></a><br><a href="https://mastodon.social/tags/Geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geometry</span></a>, <a href="https://mastodon.social/tags/NolanR" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NolanR</span></a>.Wallach</p>
꧁ᐊ𰻞ᵕ̣̣̣̣̣̣́́♛ᵕ̣̣̣̣̣̣́́𰻞ᐅ꧂<p>So ðis is big b😳lls,</p><p><a href="https://mastodon.gamedev.place/tags/TilingTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TilingTuesday</span></a> <a href="https://mastodon.gamedev.place/tags/ballpitOwO" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ballpitOwO</span></a> <a href="https://mastodon.gamedev.place/tags/tiling" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tiling</span></a> <a href="https://mastodon.gamedev.place/tags/abstract" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>abstract</span></a> <a href="https://mastodon.gamedev.place/tags/mathart" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathart</span></a> <a href="https://mastodon.gamedev.place/tags/mastoart" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mastoart</span></a> <a href="https://mastodon.gamedev.place/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a></p>
foldworks<p>Shah-i-Zinda, Samarkand, Uzbekistan. </p><p>“The Shah-i-Zinda Ensemble includes mausoleums and other ritual buildings of 11th–15th and 19th centuries. ...meaning "The living king" … The Shah-i-Zinda complex was formed over eight (from the 11th until the 19th) centuries and now includes more than twenty buildings.” <a href="https://en.wikipedia.org/wiki/Shah-i-Zinda" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Shah-i-Z</span><span class="invisible">inda</span></a></p><p><a href="https://mathstodon.xyz/tags/TilingTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TilingTuesday</span></a> <a href="https://mathstodon.xyz/tags/tiling" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tiling</span></a> <a href="https://mathstodon.xyz/tags/IslamicPattern" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IslamicPattern</span></a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/mathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathArt</span></a> <a href="https://mathstodon.xyz/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://mathstodon.xyz/tags/architecture" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>architecture</span></a> <a href="https://mathstodon.xyz/tags/hexagon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hexagon</span></a></p>
n-gons<p>Pentagram flowers for <a href="https://mathstodon.xyz/tags/TilingTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TilingTuesday</span></a> </p><p><a href="https://mathstodon.xyz/tags/Geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geometry</span></a> <a href="https://mathstodon.xyz/tags/Tiling" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Tiling</span></a> <a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathArt</span></a></p>
mindsConnected<p>This mathematical puzzle has baffled even the smartest people for 200 years, until this guy cracked it. <a href="https://mindsconnected.tech/index.php?showtopic=1129&amp;view=findpost&amp;p=8625" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">mindsconnected.tech/index.php?</span><span class="invisible">showtopic=1129&amp;view=findpost&amp;p=8625</span></a> <a href="https://mastodon.social/tags/math" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>math</span></a> <a href="https://mastodon.social/tags/mathematics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathematics</span></a> <a href="https://mastodon.social/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mastodon.social/tags/algebra" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>algebra</span></a> <a href="https://mastodon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a></p><p>(please leave your comments in the thread linked)</p>
Hacker News<p>Dimension 126 Contains Twisted Shapes, Mathematicians Prove</p><p><a href="https://www.quantamagazine.org/dimension-126-contains-strangely-twisted-shapes-mathematicians-prove-20250505/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">quantamagazine.org/dimension-1</span><span class="invisible">26-contains-strangely-twisted-shapes-mathematicians-prove-20250505/</span></a></p><p><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HackerNews</span></a> <a href="https://mastodon.social/tags/Dimension126" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Dimension126</span></a> <a href="https://mastodon.social/tags/TwistedShapes" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TwistedShapes</span></a> <a href="https://mastodon.social/tags/Mathematics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mathematics</span></a> <a href="https://mastodon.social/tags/Proofs" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proofs</span></a> <a href="https://mastodon.social/tags/Geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geometry</span></a></p>
Hacker News<p>Geometrically understanding calculus of inverse functions (2023)</p><p><a href="https://tobylam.xyz/2023/11/27/inverse-functions-legendre-part-1" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">tobylam.xyz/2023/11/27/inverse</span><span class="invisible">-functions-legendre-part-1</span></a></p><p><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HackerNews</span></a> <a href="https://mastodon.social/tags/Geometrically" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geometrically</span></a> <a href="https://mastodon.social/tags/understanding" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>understanding</span></a> <a href="https://mastodon.social/tags/calculus" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calculus</span></a> <a href="https://mastodon.social/tags/of" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>of</span></a> <a href="https://mastodon.social/tags/inverse" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>inverse</span></a> <a href="https://mastodon.social/tags/functions" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>functions</span></a> <a href="https://mastodon.social/tags/inverse" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>inverse</span></a> <a href="https://mastodon.social/tags/functions" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>functions</span></a> <a href="https://mastodon.social/tags/calculus" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calculus</span></a> <a href="https://mastodon.social/tags/mathematics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathematics</span></a> <a href="https://mastodon.social/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a></p>
Sci-books.com<p>Poisson Structures (Grundlehren der mathematischen Wissenschaften Book 347) 2013th Edition by Camille Laurent-Gengoux (PDF)<br>Author: Camille Laurent-Gengoux<br>File Type: PDF<br>Download at <a href="https://sci-books.com/poisson-structures-grundlehren-der-mathematischen-wissenschaften-book-347-2013th-edition-b00fc9nzzq/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">sci-books.com/poisson-structur</span><span class="invisible">es-grundlehren-der-mathematischen-wissenschaften-book-347-2013th-edition-b00fc9nzzq/</span></a><br><a href="https://mastodon.social/tags/Geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geometry</span></a>, <a href="https://mastodon.social/tags/CamilleLaurent" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CamilleLaurent</span></a>-Gengoux</p>
Dan Drake 🦆<p>Crows can do geometry!</p><p><a href="https://www.npr.org/2025/04/12/nx-s1-5359438/a-crows-math-skills-include-geometry" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">npr.org/2025/04/12/nx-s1-53594</span><span class="invisible">38/a-crows-math-skills-include-geometry</span></a></p><p>The particular test involved crows identifying a shape that was different from some others -- very reminiscent of the "Which One Doesn't Belong?" book from Talking Math With Your Kids:</p><p><a href="https://talkingmathwithkids.com/wodb-about/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">talkingmathwithkids.com/wodb-a</span><span class="invisible">bout/</span></a></p><p>(Last time I taught linear algebra, I did an assignment like that -- students had to come up with four matrices, and for each one of them, come up with some linear-algebraic way in which that matrix didn't belong with the other four. It was fun.)</p><p><a href="https://mathstodon.xyz/tags/tmwyk" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tmwyk</span></a> <a href="https://mathstodon.xyz/tags/crows" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>crows</span></a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/math" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>math</span></a></p>
Alexis Pierre<p>Divide/mirror/fill</p><p><a href="https://mastodon.social/tags/generativeart" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>generativeart</span></a> <a href="https://mastodon.social/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mastodon.social/tags/pattern" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pattern</span></a></p>
n-gons<p>Hexagonal tiling with stars, squares and assymmetric kites for <a href="https://mathstodon.xyz/tags/TilingTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TilingTuesday</span></a></p><p><a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathArt</span></a> <a href="https://mathstodon.xyz/tags/Geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geometry</span></a> <a href="https://mathstodon.xyz/tags/Tiling" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Tiling</span></a> <a href="https://mathstodon.xyz/tags/Hexagon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hexagon</span></a></p>
foldworks<p>Floor tiles, Imperial Citadel of Thăng Long, Hanoi, Vietnam<br><a href="https://mathstodon.xyz/tags/Tiling" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Tiling</span></a> <a href="https://mathstodon.xyz/tags/TilingTuesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TilingTuesday</span></a> <a href="https://mathstodon.xyz/tags/Pattern" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Pattern</span></a> <a href="https://mathstodon.xyz/tags/Geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geometry</span></a> <a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathArt</span></a> <a href="https://mathstodon.xyz/tags/MathsArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathsArt</span></a> <a href="https://mathstodon.xyz/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a></p>
ƧƿѦςɛ♏ѦਹѤʞ<p>The Thompson Problem.<br><a href="https://www.youtube.com/watch?v=dNTnk1VFoJY" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">youtube.com/watch?v=dNTnk1VFoJY</span><span class="invisible"></span></a><br><a href="https://mastodon.social/tags/GolfBalls" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GolfBalls</span></a> <a href="https://mastodon.social/tags/polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>polyhedra</span></a> <a href="https://mastodon.social/tags/Goldberg" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Goldberg</span></a> <br><a href="https://mastodon.social/tags/maths" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>maths</span></a> <a href="https://mastodon.social/tags/mathematics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathematics</span></a> <a href="https://mastodon.social/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mastodon.social/tags/electrons" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electrons</span></a></p>
Brokk O. LeeAufteilung | Fuji XT5 | XF23mmF1.4<br> <br> <a href="https://pixelfed.social/discover/tags/Fotografie?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Fotografie</a> <a href="https://pixelfed.social/discover/tags/Photography?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Photography</a> <a href="https://pixelfed.social/discover/tags/FujiX?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#FujiX</a> <a href="https://pixelfed.social/discover/tags/BrokkoGrafie?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#BrokkoGrafie</a> <a href="https://pixelfed.social/discover/tags/StreetPhotography?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#StreetPhotography</a> <a href="https://pixelfed.social/discover/tags/CityScape?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#CityScape</a> <a href="https://pixelfed.social/discover/tags/UrbanPhotography?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#UrbanPhotography</a> <a href="https://pixelfed.social/discover/tags/Architecture?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Architecture</a> <a href="https://pixelfed.social/discover/tags/Geometry?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Geometry</a>
foldworks<p>I tried to model these origami as transformation between cube and octahedron in Geogebra, but ended up with this instead<br><a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathArt</span></a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/animation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>animation</span></a> <a href="https://mathstodon.xyz/tags/loop" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>loop</span></a> <a href="https://mathstodon.xyz/tags/geogebra" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geogebra</span></a> <a href="https://mathstodon.xyz/tags/tetrahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tetrahedron</span></a> <a href="https://mathstodon.xyz/tags/3d" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>3d</span></a></p>
foldworks<p>Two modular origami cubes made from 1:√2 rectangles and squares (Canoe Unit 90° by me).<br><a href="https://mathstodon.xyz/tags/origami" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>origami</span></a> @origami <a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathArt</span></a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/cube" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cube</span></a> <a href="https://mathstodon.xyz/tags/ModularOrigami" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ModularOrigami</span></a> <a href="https://mathstodon.xyz/tags/papercraft" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>papercraft</span></a> <a href="https://mathstodon.xyz/tags/craft" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>craft</span></a></p>
foldworks<p>Three modular origami octahedra made from three different kinds of rectangles (Canoe Unit 60° by me).<br>From left to right, the rectangles are 1:√2, square and 2:√3.</p><p><a href="https://mathstodon.xyz/tags/origami" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>origami</span></a> @origami <a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathArt</span></a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/octahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>octahedron</span></a> <a href="https://mathstodon.xyz/tags/ModularOrigami" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ModularOrigami</span></a> <a href="https://mathstodon.xyz/tags/papercraft" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>papercraft</span></a> <a href="https://mathstodon.xyz/tags/craft" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>craft</span></a></p>
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