The VIP-system nice recurrence conjecture

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Let F\mathcal F be the collection of all non-empty finite subsets of N\mathbb N, let GG be a countable abelian group, and let v:F→Gv:\mathcal F\to G be a VIP-system, meaning that there is a t∈Nt\in\mathbb N such that for every pairwise disjoint α0,…,αt∈F\alpha_0,\ldots,\alpha_t\in\mathcal F,

∑β⊆{0,…,t}β≠∅(−1)∣β∣v(⋃j∈βαj)=0G.\sum_{\substack{\beta\subseteq\{0,\ldots,t\}\\ \beta\ne\emptyset}}(-1)^{|\beta|}v\left(\bigcup_{j\in\beta}\alpha_j\right)=0_G.

VIP-system recurrence conjecture. The VIP-system vv is good for nice recurrence.

The statement is presented as a simplified equivalent form of a conjecture of Bergelson and McCutcheon. Its resolution is not supplied in the provided text.

References

Primary source

Rigoberto Zelada, “Polynomial maps which are not good for nice recurrence and applications”, arXiv:2607.27582 (2026).

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