I can't seem to find an example of a function $f \colon \mathbb{R}^2\to \mathbb{R}$ which is $C^1$ and such that the set of its critical values is not of zero measure.
What examples are there? $\phantom{aaa}$
A counterexample for Sard's theorem in $C^1$ regularity
Espace' etale
- 478
- 4
- 9