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math.GR2023
Commensurated hyperbolic subgroups
Nir Lazarovich, Alex Margolis, Mahan Mj
We show that if H is a non-elementary hyperbolic commensurated subgroup of infinite index in a hyperbolic group G, then H is virtually a free product of hyperbolic surface groups a…
math.GR2023
Greenberg-Shalom's Commensurator Hypothesis and Applications
Nic Brody, David Fisher, Mahan Mj +1
We discuss many surprising implications of a positive answer to a question raised in some cases by Greenberg in the s and more generally by Shalom in the early s. We ref…