this post was submitted on 09 Jun 2025
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Science Memes

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Baldur's Gayte (mander.xyz)
submitted 1 week ago by [email protected] to c/[email protected]
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[–] [email protected] 24 points 1 week ago (1 children)

A circle is a plane folded on itself so the answer is technically 0 holes. But first what is a hole?

[–] [email protected] 17 points 1 week ago* (last edited 1 week ago)

a sphere is a plane folded in on itself, and spheres have no (one-dimensional) holes. but spheres do have a two-dimensional hole, which is basically a way of saying they’re hollow.

a circle is a line folded in on itself, and circles have one (one-dimensional) hole.

edit: the claim that circles and straws are homotopic is basically a fancy way of saying: “if you place a straw upright on a table and flatten it by smashing your hand down on it, you will end up with a circle.”