In the Smale's proof of diffeomorphisms of 2-sphere while proving the Lemma 2, he made a remark that This is exactly the part of the proof of Theorem A which does not extend to the case of $S^n$. I am unable to understand it. Can anyone help me?
2026-03-29 04:34:40.1774758880
Smale's proof on diffeomorphisms of 2-sphere
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