Do you know where I can find (preferably online) a proof for the possibility of a sphere eversion?
2026-03-26 14:26:01.1774535161
Proof for sphere eversion
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It's a question of proof acceptance:
Let you impress by the famous video 'Outside In' by Bill Thurston and collaborators ...
Or you may wish to invest more time and look into Scott Carter's book.
Added in edit:
A less informal & more technical reference is Bednorz & Bednorz, as proposed in Akiva Weinberger's comment to the OP.