A dichotomy of sets via typical differentiability
Research output: Contribution to journal › Article › peer-review
Colleges, School and Institutes
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||42|
|Journal||Forum of Mathematics, Sigma|
|Publication status||Published - 4 Nov 2020|
- differentiability of Lipschitz functions, Baire category, purely unrectifiable, Banach-Mazur game