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arXiv math/0507243math.DS
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自由群作用的球平均收敛性

Convergence of spherical averages for actions of free groups

Alexander I. Bufetov

摘要:

对于自由群的保测度作用,得到了非一致球平均的收敛性。这一结果推广了Grigorichuk,Nevo和Stein的定理[特别地,得到了关于一致球面平均的Nevo-Stein定理的一个简单证明]。证明使用马尔可夫算子的方法,首先提出的R. I。格里戈丘克对于一个自由群的保测度作用和一个权矩阵,以球平均值与权矩阵的收敛等价于马尔可夫算子的幂收敛的方式,赋予一个马尔可夫算子.最后一个是使用Rota的“Alternierende Verfahren”; Kaimanovich形式的Markov算子的0-2定律;和一个合适的极大不等式得到的。

英文摘要:

Convergence of non-uniform spherical averages is obtained for measure-preserving actions of free groups. This result generalizes theorems of Grigorichuk, Nevo and Stein [in particular, a simpler proof of the Nevo-Stein theorem about uniform spherical averages is obtained.] The proof uses the Markov operator approach, first proposed by R.I. Grigorchuk. To a measure-preserving action of a free group and a matrix of weights, a Markov operator is assigned in such a way that convergence of spherical averages with corresponding weights is equivalent to convergence of powers of the Markov operator. That last is obtained using Rota's "Alternierende Verfahren"; the 0-2 law for Markov operators in the form of Kaimanovich; and a suitable maximal inequality.

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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