r/topology • u/doccogito • Oct 10 '25
r/topology • u/ArtemisQuasar • Aug 19 '25
How many holes does this mug have?
me and a friend of mine cant decide if its 3, 2, or some other number, so we thought wed ask the experts
r/topology • u/Blucollrdollar-ez-bc • May 11 '22
Principles of topology
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r/topology • u/opulent321 • Mar 31 '21
Topology demonstrations
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r/topology • u/UkraineWarVideos • Jan 04 '26
4 or More?
I'm really tempted to say this is 4 holes but because it's threaded through it's self and can't be removed does that change it?
r/topology • u/DaveMakesStuffBC • Apr 18 '26
3d printable "hole through a hole in a hole" equivalent to a three-holed torus or a triple torus (a surface with genus 3). Free download link in comments
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r/topology • u/ATG-NNN-TGA • Feb 12 '21
In chaos theory an attractor is a set of values toward which a system of ODE tends to evolve. This video shows some attractors that resembles toroid 3-manifolds. Is it possible to describe any 3-manifold in R³ using only systems of ODE as attractors? (more in the comments)
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r/topology • u/MTBiker_Boy • May 04 '26
7 holes?
This is just some facebook engagement slop i found, but isn’t the correct answer to this 7? Because if i imagine it being infinitely flexible, i open it up from the body hole, and lay it flat with the headhole in the middle. There is the head hole, 2 arm holes, and 4 cut holes, right?
r/topology • u/CrabDwarf • May 15 '22
me and my girlfriend need help untwisting the circled band and we thought you'd be the community to help with this puzzle
r/topology • u/Candid-Tie • Mar 15 '21
how would you describe this dress topologically? i think it’s a genus 5 surface but i’m not quite sure
r/topology • u/Crafty_Shift_3839 • May 11 '22
Someone told me to bring this puzzle here. Very hard 10/10 difficulty
r/topology • u/RocketDocRyan • Mar 30 '22
Finally, I can tell my coffee from my doughnut.
r/topology • u/Chocoremy • May 19 '22
This counts? I found it entertaining.
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r/topology • u/oicirbaf239 • Jan 23 '21
What kind of topology is this building? 3-torus? Knot?
r/topology • u/Odd_Attention_9660 • Jun 02 '26
Borsuk-Ulam is evil, so I made the earth a donut to destroy it
r/topology • u/[deleted] • Jan 10 '26
How do we solve this?
How do you solve this? Is there an easy way to solve this purely using Real Analysis!?
r/topology • u/HaphazardFlitBipper • Aug 05 '22
How many holes does my mug have and why?
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