English

The Morse minimal system is nearly continuously Kakutani equivalent to the binary odometer

Dynamical Systems 2014-04-02 v1

Abstract

Ergodic homeomorphisms TT and SS of Polish probability spaces XX and YY are evenly Kakutani equivalent if there is an orbit equivalence ϕ:X0Y0\phi: X_0 \rightarrow Y_0 between full measure subsets of XX and YY such that, for some AX0A \subset X_0 of positive measure, ϕ\phi restricts to a measurable isomorphism of the induced systems TAT_A and Sϕ(A)S_{\phi(A)}. The study of even Kakutani equivalence dates back to the seventies, and it is well known that any two zero-entropy loosely Bernoulli systems are evenly Kakutani equivalent. But even Kakutani equivalence is a purely measurable relation, while systems such as the Morse minimal system are both measurable and topological. Recently del Junco, Rudolph and Weiss studied a new relation called nearly continuous Kakutani equivalence. A nearly continuous Kakutani equivalence is an even Kakutani equivalence where also X0X_0 and Y0Y_0 are invariant GδG_\delta sets, AA is within measure zero of both open and closed, and ϕ\phi is a homeomorphism from X0X_0 to Y0Y_0. It is known that nearly continuous Kakutani equivalence is strictly stronger than even Kakutani equivalence, and nearly continuous Kakutani equivalence is the natural strengthening of even Kakutani equivalence to the nearly continuous category---the category where maps are continuous after sets of measure zero are removed. In this paper we show that the Morse minimal substitution system is nearly continuously Kakutani equivalent to the binary odometer.

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Cite

@article{arxiv.1404.0246,
  title  = {The Morse minimal system is nearly continuously Kakutani equivalent to the binary odometer},
  author = {Andrew Dykstra and Ayse Sahin},
  journal= {arXiv preprint arXiv:1404.0246},
  year   = {2014}
}

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