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Borel subsystems and ergodic universality for compact Zd-systems via specification and beyond
Proceedings of the London Mathematical Society ( IF 1.5 ) Pub Date : 2021-02-10 , DOI: 10.1112/plms.12398
Nishant Chandgotia 1 , Tom Meyerovitch 2
Affiliation  

A Borel Z d dynamical system ( X , S ) is ‘almost Borel universal’ if any free Borel Z d dynamical system ( Y , T ) of strictly lower entropy is isomorphic to a Borel subsystem of ( X , S ) , after removing a null set. We obtain and exploit a new sufficient condition for a topological Z d dynamical system to be almost Borel universal. We use our main result to deduce various conclusions and answer a number of questions. Along with additional results, we prove that a ‘generic’ homeomorphism of a compact manifold of topological dimension at least two can model any ergodic transformation, that non-uniform specification implies almost Borel universality, and that 3-colorings in Z d and dimers in Z 2 are almost Borel universal.

中文翻译:

Borel 子系统和通过规范及超越的紧凑 Zd 系统的遍历普遍性

一个波雷尔 Z d 动力系统 ( X , ) 如果有任何免费的 Borel,则“几乎是 Borel 通用的” Z d 动力系统 ( , ) 严格低熵的同构于一个 Borel 子系统 ( X , ) , 删除空集后。我们获得并利用拓扑的新充分条件 Z d 动力系统几乎是Borel通用的。我们使用我们的主要结果来推导出各种结论并回答一些问题。连同额外的结果,我们证明了拓扑维数至少为 2 的紧凑流形的“通用”同胚可以模拟任何遍历变换,非均匀规范意味着几乎 Borel 普遍性,并且 3-colorings in Z d 和二聚体 Z 2 几乎是 Borel 通用的。
更新日期:2021-02-10
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