Any diffeomorphism of a circle can be extended to a diffeomorphism of a circle. I was trying to do it by using the Radó–Kneser–Choquet theorem as provided here. I did the proof which is given in the Duren's book Harmonic mappings in the plane. But, he only proves about the homeomorphism. How to prove the diffeomorphism. Any help!
2026-03-26 02:54:59.1774493699
Diffeomorphisms of circle extends to diffeomorphisms of disk
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