The Borel complexity of von Neumann equivalence

Autor: Inessa Moroz, Asger Törnquist

Publikováno v: Moroz, I & Törnquist, A 2021, ' The Borel complexity of von Neumann equivalence ', Annals of Pure and Applied Logic, vol. 172, no. 5, 102913 . https://doi.org/10.1016/j.apal.2020.102913

We prove that for a countable discrete group Γ containing a copy of the free group F n , for some 2 ≤ n ≤ ∞ , as a normal subgroup, the equivalence relations of conjugacy, orbit equivalence and von Neumann equivalence of the ergodic a.e. free

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