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arXiv 1012.1130math.DSmath.PR
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随机序列与多重遍历序列的点态收敛

Random Sequences and Pointwise Convergence of Multiple Ergodic Averages

Nikos Frantzikinakis, Emmanuel Lesigne, Mate Wierdl

摘要:

我们证明了点态收敛,作为$N\to \infty$,多遍历平均$\frac{1}{N}\sum_{n=1}^N f(T^nx)\cdot g(S^{a_n}x)$,其中$T$和$S$是交换保测变换,和$a_n$是一个随机版本的序列$[n^c]$为一些适当的$c>1$。我们还证明了类似的平均值收敛结果的形式$\frac{1}{N}\sum_{n=1}^N f(T^{a_n}x)\cdot g(S^{a_n}x)$,以及逐点的结果时,$T$和$S$的权力相同的转换。这些结果的确定性版本,其中一个取代$a_n$与$[n^c]$,仍然是开放的,我们希望我们的方法将表明一个富有成效的方式来处理这些问题。

英文摘要:

We prove pointwise convergence, as $N\to \infty$, for the multiple ergodic averages $\frac{1}{N}\sum_{n=1}^N f(T^nx)\cdot g(S^{a_n}x)$, where $T$ and $S$ are commuting measure preserving transformations, and $a_n$ is a random version of the sequence $[n^c]$ for some appropriate $c>1$. We also prove similar mean convergence results for averages of the form $\frac{1}{N}\sum_{n=1}^N f(T^{a_n}x)\cdot g(S^{a_n}x)$, as well as pointwise results when $T$ and $S$ are powers of the same transformation. The deterministic versions of these results, where one replaces $a_n$ with $[n^c]$, remain open, and we hope that our method will indicate a fruitful way to approach these problems as well.

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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