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arXiv 1808.00341math.DSmath.LO
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强遍历远端作用刚性的模型论方法

A model-theoretic approach to rigidity of strongly ergodic, distal actions

Tomás Ibarlucía, Todor Tsankov

摘要:

我们开发了一个模型理论框架的研究远因子的强遍历,测度保持动力系统可数群。我们的主要结果是,所有这些因素都包含在(存在)代数闭包的空集。这使我们能够恢复一些刚性的结果Ioana和Tucker-Drob以及证明一些新的:例如,强遍历,远端系统是合并的,每两个这样的系统是弱等价的同构。我们还证明了存在一个普遍的远端,遍历系统,包含任何其他远端,遍历系统的组作为一个因素。

英文摘要:

We develop a model-theoretic framework for the study of distal factors of strongly ergodic, measure-preserving dynamical systems of countable groups. Our main result is that all such factors are contained in the (existential) algebraic closure of the empty set. This allows us to recover some rigidity results of Ioana and Tucker-Drob as well as prove some new ones: for example, that strongly ergodic, distal systems are coalescent and that every two such systems that are weakly equivalent are isomorphic. We also prove the existence of a universal distal, ergodic system that contains any other distal, ergodic system of the group as a factor.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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