The random-group theory conjecture for densities below one-half

Let 0d<120\leq d<\frac{1}{2}, and let ψ\psi be a first-order sentence in the language of groups. Let FkF_k be the free group of rank k2k\geq 2, and consider the density-dd random-group model on a fixed basis of FkF_k. Random-group theory conjecture. The random group of density dd satisfies ψ\psi with overwhelming probability if and only if the free group FkF_k satisfies ψ\psi. This extends the conjectures of Knight and of Kharlampovich and Sklinos relating first-order theories of free groups to those of random groups. The statement concerns all densities below the hyperbolicity threshold 12\frac{1}{2}; the supplied source does not state whether it has been proved or disproved.

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Primary source

Sobhi Massalha, “Sentences over Random Groups I: Existential Sentences”, arXiv:2406.15080 (2024).

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