this post was submitted on 09 Jun 2025
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Science Memes

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[–] affiliate@lemmy.world 0 points 6 days 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.

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