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6 votes

Is the space of diffeomorphisms homotopy equivalent to a CW-complex?

[Edit: Allen Hatcher posted an answer while I was writing this one. Both answers seem to use similar ideas. I will leave my answer here anyway.] $\newcommand{\Diff}{\operatorname{Diff}}$$\newcommand{ …
Ricardo Andrade's user avatar
30 votes
4 answers
3k views

Is the space of diffeomorphisms homotopy equivalent to a CW-complex?

Clarification: My question concerns the homotopy type of the space of $C^k$ diffeomorphisms with the compact-open $C^k$ topology, where $0< k \leq\infty$. I have stated my question below with $k=1$ fo …
Ricardo Andrade's user avatar