alt Hacker NewsA manifold is a surface that you can put a cd shaped object on in any place on the surface, you can change the radius of the cd but it has to have some radius above 0.
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BigTTYGothGF • 11/04/2025
> you can put a cd shaped object on
You're thinking of open sets.
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Nicely done!
Initially I recoiled at the thought of the stiffness of the CD, but of course your absolutely right, at least for 2d manifolds.