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arXiv 2102.09967math.DSmath.CO
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序列的联合遍历性

Joint ergodicity of sequences

Nikos Frantzikinakis

摘要:

一个整数序列的集合是联合遍历的,如果对于每个遍历测度保持系统,多重遍历平均值,通过这个序列集合给出的迭代,在平均值中收敛到积分的乘积。我们给出了联合遍历的充要条件,这些条件足够灵活,可以恢复大多数已知的联合遍历序列的例子,也可以回答一些相关的公开问题。我们的论证的一个有趣的特点是,它们避免了以前用来建立类似结果的遍历论的深层工具。我们的方法主要是基于一个遍历变体的技术开创了Peluse和Prendiville为了给定量变量的有限版本的多项式Szemerédi定理。

英文摘要:

A collection of integer sequences is jointly ergodic if for every ergodic measure preserving system the multiple ergodic averages, with iterates given by this collection of sequences, converge in the mean to the product of the integrals. We give necessary and sufficient conditions for joint ergodicity that are flexible enough to recover most of the known examples of jointly ergodic sequences and also allow us to answer some related open problems. An interesting feature of our arguments is that they avoid deep tools from ergodic theory that were previously used to establish similar results. Our approach is primarily based on an ergodic variant of a technique pioneered by Peluse and Prendiville in order to give quantitative variants for the finitary version of the polynomial Szemerédi theorem.

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