English

Return time sets and product recurrence

Dynamical Systems 2026-02-04 v2

Abstract

Let GG be a countable infinite discrete group. We show that a subset FF of GG contains a return time set of some piecewise syndetic recurrent point xx in a compact Hausdorff space XX with a GG-action if and only if FF is a quasi-central set. As an application, we show that if a nonempty closed subsemigroup SS of the Stone-\v{C}ech compactification βG\beta G contains the smallest ideal K(βG)K(\beta G) of βG\beta G then SS-product recurrent is equivalent to distality, which partially answers a question of Auslander and Furstenberg (Trans. Amer. Math. Soc. 343, 1994, 221--232).

Cite

@article{arxiv.2406.18231,
  title  = {Return time sets and product recurrence},
  author = {Jian Li and Xianjuan Liang and Yini Yang},
  journal= {arXiv preprint arXiv:2406.18231},
  year   = {2026}
}

Comments

32 pages, to appear in Fund. Math

R2 v1 2026-06-28T17:19:44.341Z