On the Rademacher maximal function

Details On the Rademacher maximal function On the Rademacher maximal function

2009-12-17

arxiv.org/abs/0912.3358v3

Studia Math., 203(1):1-31, 2011

Mathematics

Functional Analysis

23 pages, 4 figures, typos corrected, proofs of Lemma 5.3 and Theorem 7.3 revised

Scientific paper

This paper studies a new maximal operator introduced by Hyt\"onen, McIntosh and Portal in 2008 for functions taking values in a Banach space. The L^p-boundedness of this operator depends on the range space; certain requirements on type and cotype are present for instance. The original Euclidean definition of the maximal function is generalized to sigma-finite measure spaces with filtrations and the L^p-boundedness is shown not to depend on the underlying measure space or the filtration. Martingale techniques are applied to prove that a weak type inequality is sufficient for L^p-boundedness and also to provide a characterization by concave functions.

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