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arXiv 1503.08863math.DS
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范数下非常规遍历平均的一个好的普适权

A good universal weight for nonconventional ergodic averages in norm

Idris Assani, Ryo Moore

摘要:

我们将证明双递归定理中出现的序列是Furstenberg平均数的一个很好的普适权。也就是说,给定一个系统$(X, \mathcal{F}, μ, T)$和有界函数$f_1, f_2 \in L^\infty(μ)$,在$X$中存在一组完全测度$X_{f_1, f_2}$,它独立于整数$a$和$b$以及正整数$k$,使得对于所有$x \in X_{f_1, f_2}$和每个其他测度保持系统$(Y, \mathcal{G}, ν, S)$,以及每个有界和可测函数$g_1, \ldots, g_k \in L^\infty(ν)$,平均值\[ \frac{1}{N} \sum_{n=1}^N f_1(T^{an}x)f_2(T^{bn}x)g_1 \circ S^n g_2 \circ S^{2n} \cdots g_k \circ S^{kn} \]收敛于$L^2(ν)$。

英文摘要:

We will show that the sequence appearing in the double recurrence theorem is a good universal weight for the Furstenberg averages. That is, given a system $(X, \mathcal{F}, μ, T)$ and bounded functions $f_1, f_2 \in L^\infty(μ)$, there exists a set of full-measure $X_{f_1, f_2}$ in $X$ that is independent of integers $a$ and $b$ and a positive integer $k$ such that for all $x \in X_{f_1, f_2}$ and for every other measure-preserving system $(Y, \mathcal{G}, ν, S)$, and each bounded and measurable function $g_1, \ldots, g_k \in L^\infty(ν)$, the averages \[ \frac{1}{N} \sum_{n=1}^N f_1(T^{an}x)f_2(T^{bn}x)g_1 \circ S^n g_2 \circ S^{2n} \cdots g_k \circ S^{kn} \] converge in $L^2(ν)$.

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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