A dichotomy of sets via typical differentiability
Research output: Contribution to journal › Article
Colleges, School and Institutes
- Department of Mathematics, University of Innsbruck
We obtain a criterion for an analytic subset of a Euclidean space to contain points of differentiability of a typical Lipschitz function, namely, that it cannot be covered by countably many sets, each of which is closed and purely unrectifiable (has zero length intersection with every $C^1$ curve). Surprisingly, we establish that any set failing this criterion witnesses the opposite extreme of typical behaviour: In any such coverable set a typical Lipschitz function is everywhere severely non-differentiable.
|Number of pages||56|
|Journal||Forum of Mathematics, Sigma|
|Publication status||Accepted/In press - 27 May 2020|