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arXiv 1005.3030math.FA
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关于极大函数Tanaka定理的离散形式

On a discrete version of Tanaka's theorem for maximal functions

Jonathan Bober, Emanuel Carneiro, Kevin Hughes, Lillian B. Pierce

摘要:

本文证明了维数为$n=1$的Hardy-Littlewood极大算子的Tanaka定理\cite{Ta}的一个离散形式,包括非中心和中心情形.对于离散非中心极大算子$\widetilde{M} $,我们证明了:给定有界变差函数$f: \mathbb{Z} \to \mathbb{R}$,$$\textrm{Var}(\widetilde{M} f) \leq \textrm{Var}(f),$$,其中$\textrm{Var}(f)$表示$f$的全变差.对于离散中心极大算子$M$,我们证明了,给定一个函数$f: \mathbb{Z} \to \mathbb{R}$,使得$f \in \ell^1(\mathbb{Z})$,$$\textrm{Var}(Mf) \leq C \|f\|_{\ell^1(\mathbb{Z})}.$$这为Hajjerasz和Onninen的问题\cite{HO}在离散一维情形下提供了正解.

英文摘要:

In this paper we prove a discrete version of Tanaka's Theorem \cite{Ta} for the Hardy-Littlewood maximal operator in dimension $n=1$, both in the non-centered and centered cases. For the discrete non-centered maximal operator $\widetilde{M} $ we prove that, given a function $f: \mathbb{Z} \to \mathbb{R}$ of bounded variation, $$\textrm{Var}(\widetilde{M} f) \leq \textrm{Var}(f),$$ where $\textrm{Var}(f)$ represents the total variation of $f$. For the discrete centered maximal operator $M$ we prove that, given a function $f: \mathbb{Z} \to \mathbb{R}$ such that $f \in \ell^1(\mathbb{Z})$, $$\textrm{Var}(Mf) \leq C \|f\|_{\ell^1(\mathbb{Z})}.$$ This provides a positive solution to a question of Hajłasz and Onninen \cite{HO} in the discrete one-dimensional case.

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