Measure preserving diffeomorphisms of the torus are unclassifiable

Matthew Foreman, Benjamin Weiss

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In 1932 von Neumann proposed classifying the statistical behavior of differentiable systems. In modern language this is interpreted as classifying diffeomorphisms of compact manifolds up to measure isomorphism. This paper proves that this is impossible in a rigorous sense.

Original languageEnglish
Pages (from-to)2605-2690
Number of pages86
JournalJournal of the European Mathematical Society
Volume24
Issue number8
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 European Mathematical Society Publishing House. All rights reserved.

Keywords

  • Anosov-Katok method
  • circular systems
  • Classification of ergodic transformations
  • distal transformations
  • odometers

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