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Baldur's Gayte
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this post was submitted on 09 Jun 2025
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A CD is clearly homotopic to a torus, though...
And the walls of a straw do have thickness...
A straw goes:
Gas - solid - gas - solid - gas
If solid torus yes, if just the regular torus (surface of the solid torus) no. CD is homotopic to a circle and so is a solid torus.
OK, that's my ignorance. I didn't realise toruses were usually hollow.
Thank you for letting me know, you're right and I've learnt something.