Non-abelian generalization of the G-infinity theorem for k-dependent groups

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Let TT be a kk-dependent theory, let AA be a small parameter set, and let GG be a type-definable group over AA. Let M⊇A\mathcal{M} \supseteq A be a small model and let bˉ1,…,bˉk−1\bar{b}_1, \ldots, \bar{b}_{k-1} be finite tuples such that (M,A,bˉ1,…,bˉk−1)(\mathcal{M},A,\bar{b}_1,\ldots,\bar{b}_{k-1}) are in a generic position. The theorem cited in the statement provides a set C⊆MC \subseteq \mathcal{M} with ∣C∣≤ℶ2(∣T∣+∣A∣)|C| \leq \beth_2(|T|+|A|) and an equality describing G∞G^{\infty} for abelian GG. Non-abelian G-infinity conjecture. The same conclusion holds for arbitrary kk-dependent groups, without assuming that GG is abelian. The conjecture proposes extending the stated G∞G^{\infty} intersection formula from type-definable abelian groups to arbitrary kk-dependent groups.

References

Primary source

Artem Chernikov and Nadja Hempel, “On n-dependent groups and fields III. Multilinear forms and invariant connected components”, arXiv:2412.19921 (2025).

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