I'm interested in examples regarding the Alexander's Trick. Can someone give an example where a diffeomorphism $f:S^{n-1}\rightarrow S^{n-1}$ extends to a diffeomorphism $D^n\rightarrow D^n$ and then another example where $f$ only extends to a homeomorphism?
2026-05-04 22:07:11.1777932431
Examples for Alexander's Trick (radial extension)
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