English

$A_1$ Fefferman-Stein inequality for maximal functions of martingales in uniformly smooth spaces

Probability 2021-08-02 v2

Abstract

Let ff be a martingale with values in a uniformly pp-smooth Banach space and ww any positive weight. We show that E(fw)E(Spfw)\mathbb{E} (f^* \cdot w) \lesssim \mathbb{E}(S_p f \cdot w^*), where \cdot^* is the martingale maximal operator and SpS_p is the p\ell^p sum of martingale increments.

Keywords

Cite

@article{arxiv.2106.07281,
  title  = {$A_1$ Fefferman-Stein inequality for maximal functions of martingales in uniformly smooth spaces},
  author = {Pavel Zorin-Kranich},
  journal= {arXiv preprint arXiv:2106.07281},
  year   = {2021}
}

Comments

v2: 16 pages, corrected following referee report