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math.DS2017★ 1 cited
Single recurrence in abelian groups
John T. Griesmer
We collect problems on recurrence for measure preserving and topological actions of a countable abelian group, considering combinatorial versions of these problems as well. We solv…
math.DS2016
Bohr neighborhoods in three-fold difference sets
John T. Griesmer
Answering a question of Hegyvári and Ruzsa , we show that if A is a set of integers having positive upper Banach density, then the set A+A-A:= {a+b-c: a, b, c are in A} contains Bo…