this post was submitted on 09 Jun 2025
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[–] iAvicenna@lemmy.world 2 points 17 hours ago* (last edited 17 hours ago) (2 children)

a torus is not homotopic to a straw though unless you take the straw and glue it at its ends. a straw is homotopic to a circle, a torus is homotopic to product of two circles, Baldur's gate is homotopic to a disk unless we are talking about the game storage medium which used to be a CD which is also homotopic to a circle

[–] Zwiebel@feddit.org 20 points 13 hours ago

You are talking about a straw of zero wall thickness right? A real straw should be homo-whatever to a torus

[–] ytg@sopuli.xyz 2 points 17 hours ago

Wouldn’t a straw be the product of a circle and a line?