Finite-to-one equivariant maps and mean dimension

Michael Levin

Published 2023-12-07Version 1

We show that a minimal dynamical system $(X,\mathbb{Z})$ on a compact metric $X$ with mdim$X=d$ admits for every natural $k>d$ an equivariant map to the shift $([0,1]^k)^{\mathbb{Z}}$ such that each fiber of this map contains at most $[k/(k-d)]k/(k-d)$ points.