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arXiv 1409.6763math.CA
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关于双参数极大多重线性算子

On a Biparameter Maximal Multilinear Operator

Peter Luthy

摘要:

众所周知,极大算子的估计和逐点收敛问题是紧密相连的。近年来,许多作者研究了所谓的“非常规遍历平均”的收敛性质,包括Assani,Austin,Host,Kra,Tao等,特别是关于这些平均在$L^2$中的收敛性已经知道很多,但关于逐点收敛性知之甚少。在这种精神下,我们考虑逐点收敛的一个特定的遍历平均和研究相应的最大三线性运营商(在$\mathbb{R}$,由于转移原则)。莱西和德米特,陶和Thiele研究了最大的多重线性算子以前,然而,我们开发的最大算子有一个新的双参数结构,以前没有遇到过,不能估计使用他们的技术。我们将使用某个泰勒级数来刻画这个双参数极大多重线性算子,并通过将其视为符号的奇异集类似于Muscalu、Tao和Thiele研究的Biest算子的奇异积分来产生两个“主”项之一的非平凡Hölder型估计。

英文摘要:

It is well-known that estimates for maximal operators and questions of pointwise convergence are strongly connected. In recent years, convergence properties of so-called `non-conventional ergodic averages' have been studied by a number of authors, including Assani, Austin, Host, Kra, Tao, and so on. In particular, much is known regarding convergence in $L^2$ of these averages, but little is known about pointwise convergence. In this spirit, we consider the pointwise convergence of a particular ergodic average and study the corresponding maximal trilinear operator (over $\mathbb{R}$, thanks to a transference principle). Lacey and Demeter, Tao, and Thiele have studied maximal multilinear operators previously; however, the maximal operator we develop has a novel bi-parameter structure which has not been previously encountered and cannot be estimated using their techniques. We will carve this bi-parameter maximal multilinear operator using a certain Taylor series and produce non-trivial Hölder-type estimates for one of the two "main" terms by treating it as a singular integrals whose symbol's singular set is similar to that of the Biest operator studied by Muscalu, Tao, and Thiele.

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