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arXiv 1105.5987math.CA
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加权L^p空间上中值极大函数有界性的一个特征

A Characterization of the boundedness of the median maximal function on weighted L^p spaces

Henri Martikainen, Tuomas Orponen

摘要:

我们介绍和研究的中位数最大函数\mathcal{M} f,定义在相同的方式作为经典的Hardy-Littlewood最大函数,只取代积分平均值f中位数的整个定义。这种变化对极大算子的映射性质有定性的影响:与Hardy-Littlewood算子在L^1上没有界相反,我们证明了\mathcal{M}在L^p(w)上有界,对所有0 < p < \infty,当且仅当w \in A_{\infty}。该表征是纯定性的,并且不给出对[w]_{ A_{\infty} }的依赖性。然而,建立了严格界\| \mathcal{M} \|_{L^1(w)\to L^1(w)} \lesssim [w]_{A_1}.

英文摘要:

We introduce and study the median maximal function \mathcal{M} f, defined in the same manner as the classical Hardy-Littlewood maximal function, only replacing integral averages of f by medians throughout the definition. This change has a qualitative impact on the mapping properties of the maximal operator: in contrast with the Hardy-Littlewood operator, which is not bounded on L^1, we prove that \mathcal{M} is bounded on L^p(w) for all 0 < p < \infty, if and only if w \in A_{\infty}. The characterization is purely qualitative and does not give the dependence on [w]_{A_{\infty}}. However, the sharp bound \|\mathcal{M}\|_{L^1(w) \to L^1(w)} \lesssim [w]_{A_1} is established.

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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