I know that isomorphism has a well known symbol, but what about diffeomorphism?
2026-05-04 23:00:56.1777935656
What's the symbol for diffeomorphism?
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The usual symbol $\cong$ is fine, e.g. if $M$ and $N$ are smooth manifolds, then you can write $M\cong N$ for saying "the manifolds $M$ and $N$ are diffeomorphic" and $f:M\xrightarrow{\;\cong\;}N$ for saying "the map $f$ is a diffeomorphism from $M$ to $N$". After all, diffeomorphisms are just the isomorphisms in the category of smooth manifolds.