Compact families and typical entropy invariants of measure-preserving actions

Abstract

For a compact set of actions, an invariant of Kushnirenko's entropy type is chosen in such a way that on this set it is equal to zero, but will be infinity for typical actions. As a consequence, we show that typical measure-preserving transformations are not isomorphic to geometric shape exchange transformations. This problem arose in connection with the result of Chaika and Davis about the atypical nature of IETs.

arXiv commentin Russian. The article is intended for Volume 82:1 of Proceedings of the Moscow Mathematical Society, dedicated to the 80th anniversaries of V.I. Oseledets and A.M. Stepin and the memory of A.M. Stepin, who left us in November 2020