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math.LO2026
Finite index extensions of treeable equivalence relations are treeable
Ruiyuan Chen, Anush Tserunyan, Robin Tucker-Drob
We prove that every countable Borel equivalence relation containing a finite index Borel treeable subequivalence relation is Borel treeable. This answers a long-standing question o…
math.DS2026
Bounded chaining in measurable dynamics
Anush Tserunyan, Jenna Zomback
We introduce a one-parameter family of notions between double ergodicity and metric ergodicity for measure-class preserving (i.e., nonsingular) actions of countable groups on stand…