Abstract
A theorem due to Hindman states that if E is a subset of ℕ with d*(E) > 0, where d* denotes the upper Banach density, then for any ε > 0 there exists N ∈ ℕ such that \(d^{\ast}(\cup_{i=1}^{N}(E-i))>1-\varepsilon\). Curiously, this result does not hold if one replaces the upper Banach density d* with the upper density \(\bar{d}\). Originally proved combinatorially, Hindman’s theorem allows for a quick and easy proof using an ergodic version of Furstenberg’s correspondence principle. In this paper, we establish a variant of the ergodic Furstenberg’s correspondence principle for general amenable (semi)-groups and obtain some new applications, which include a refinement and a generalization of Hindman’s theorem and a characterization of countable amenable minimally almost periodic groups.
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The authors would like to thank the referee to whom the present version of this paper owes a great deal.
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Bergelson, V., Moragues, A.F. An ergodic correspondence principle, invariant means and applications. Isr. J. Math. 245, 921–962 (2021). https://doi.org/10.1007/s11856-021-2233-y
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DOI: https://doi.org/10.1007/s11856-021-2233-y