The higher-order recurrence conjecture for Bohr-Hamming balls

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For r∈Nr\in\mathbb N, let BH:=BH(β,y,k,ε)BH:=BH(\bm\beta,\bm y,k,\varepsilon) be a proper Bohr-Hamming Ball, with ε>0\varepsilon>0 and y∈Try\in\mathbb T^r. Define

BH1/k:=n∈N:nk∈BH.BH^{1/k}:=\\{n\in\mathbb N:n^k\in BH\\}.

A set is (δ,k)(\delta,k)-recurrent when it has the (δ,k)(\delta,k)-recurrence property used in the paper. Higher-order recurrence conjecture. For all δ>0\delta>0, there exists k0∈Nk_0\in\mathbb N such that for every r∈Nr\in\mathbb N and every proper Bohr-Hamming Ball BH:=BH(β,y,k,ε)BH:=BH(\bm\beta,\bm y,k,\varepsilon) with k≥k0k\geq k_0, ε>0\varepsilon>0 and y∈Try\in\mathbb T^r, the set BH1/kBH^{1/k} is (δ,k)(\delta,k)-recurrent. This is proposed as an analogue of the preceding recurrence lemma and as a possible route toward higher-order recurrence results for k≥3k\geq3; the source does not indicate whether it is known or resolved.

References

Primary source

John T. Griesmer, “A set of 2-recurrence whose perfect squares do not form a set of measurable recurrence”, arXiv:2207.11851 (2023).

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