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arXiv · 2003.04077

A Weighted Prékopa-Leindler inequality and sumsets with quasicubes

Ben Green·Dávid Matolcsi·Imre Ruzsa·George Shakan·Dmitrii Zhelezov
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Abstract

We give a short, self-contained proof of two key results from a paper of four of the authors. The first is a kind of weighted discrete Prékopa-Leindler inequality. This is then applied to show that if $A, B \subseteq \mathbb{Z}^d$ are finite sets and $U$ is a subset of a "quasicube" then $|A + B + U| \geq |A|^{1/2} |B|^{1/2} |U|$. This result is a key ingredient in forthcoming work of the fifth author and Pälvölgyi on the sum-product phenomenon.

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Ben Green, Dávid Matolcsi, Imre Ruzsa, George Shakan, Dmitrii Zhelezov. 2020-03-09. A Weighted Prékopa-Leindler inequality and sumsets with quasicubes. https://arxiv.org/abs/2003.04077

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