I am searching for a reference with a proof of the statement: Every orientation preserving self-diffeomorphism of $S^3$ is isotopic to the identity. I searched in many books aswell as online, but did not find anything other than the statement in the PL category. Thank you for your time.
2026-03-26 01:34:54.1774488894
Reference request: Every self-diffeomorphism of $S^3$ is isotopic to the identity
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