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Relatively weakly mixing models for dynamical systems
Published online by Cambridge University Press: 10 November 2014
Abstract
A classical result in ergodic theory says that there always exists a topological model for any factor map ${\it\pi}:(X,{\mathcal{X}},{\it\mu},T)\rightarrow (Y,{\mathcal{Y}},{\it\nu},S)$ of ergodic systems. That is, there are some topological factor map
$\hat{{\it\pi}}:(\hat{X},\hat{T})\rightarrow ({\hat{Y}},{\hat{S}})$ and invariant measures
$\hat{{\it\mu}}$,
$\hat{{\it\nu}}$ such that the diagram
$$\begin{eqnarray}\displaystyle & & \displaystyle \nonumber\end{eqnarray}$$
${\it\phi}$ and
${\it\psi}$ are measure theoretical isomorphisms. In this paper, we show that one can require that in the above result
$\hat{{\it\pi}}$ is either weakly mixing or finite-to-one. Also, we present some related questions.
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- © Cambridge University Press, 2014
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