Property PnaiveP_{naive} for acylindrically hyperbolic groups

preprint2018arXivOpen access

Abstract

We prove that every acylindrically hyperbolic group that has no non-trivial finite normal subgroup satisfies a strong ping pong property, the PnaiveP_{naive} property: for any finite collection of elements h1,…,hkh_1, \dots, h_k, there exists another element γ≠1γ\neq 1 such that for all ii, ⟨hi,γ⟩=⟨hi⟩∗⟨γ⟩\langle h_i, γ\rangle = \langle h_i \rangle* \langle γ\rangle. We also obtain that if a collection of subgroups H1,…,HkH_1, \dots, H_k is a hyperbolically embedded collection, then there is γ≠1γ\neq 1 such that for all ii, ⟨Hi,γ⟩=Hi∗⟨γ⟩\langle H_i, γ\rangle = H_i * \langle γ\rangle.

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