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

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

2011-05-30

arxiv.org/abs/1105.5987v1

Mathematics

Classical Analysis and ODEs

8 pages

Scientific paper

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.

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