Direct and inverse results for popular differences in trees of positive dimension
ERGODIC THEORY AND DYNAMICAL SYSTEMS(2024)
Abstract
We establish analogues for trees of results relating the density of a set ${E \subset \mathbb {N}}$ , the density of its set of popular differences and the structure of E. To obtain our results, we formalize a correspondence principle of Furstenberg and Weiss which relates combinatorial data on a tree to the dynamics of a Markov process. Our main tools are Kneser-type inverse theorems for sets of return times in measure-preserving systems. In the ergodic setting, we use a recent result of the first author with Bjorklund and Shkredov and a stability-type extension (proved jointly with Shkredov); we also prove a new result for non-ergodic systems.
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Key words
Ramsey theory on trees,return times,inverse theorems,popular difference sets
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