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Around the variational principle for metric mean dimension

Volume 261 / 2021

Yonatan Gutman, Adam Śpiewak Studia Mathematica 261 (2021), 345-360 MSC: 37A05, 37A35, 37B40, 94A34. DOI: 10.4064/sm201029-23-2 Published online: 28 June 2021


We study variational principles for metric mean dimension. First we prove that in the variational principle of Lindenstrauss and Tsukamoto it suffices to take the supremum over ergodic measures. Second we derive a variational principle for metric mean dimension involving growth rates of measure-theoretic entropy of partitions decreasing in diameter which holds in full generality and in particular does not necessitate the assumption of tame growth of covering numbers. The expressions involved are a dynamical version of Rényi information dimension. Third we derive a new expression for the Geiger–Koch information dimension rate for ergodic shift-invariant measures. Finally we develop a lower bound for metric mean dimension in terms of Brin–Katok local entropy.


  • Yonatan GutmanInstitute of Mathematics
    Polish Academy of Sciences
    Śniadeckich 8
    00-656 Warszawa, Poland
  • Adam ŚpiewakInstitute of Mathematics
    University of Warsaw
    Banacha 2
    02-097 Warszawa, Poland

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