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math.GR2026
Classification of Fuchsian groups with torsion
George Peterzil
In their recent paper, Bergfalk and Smythe prove that the isometry equivalence relation on hyperbolic surfaces with finitely-generated fundamental group is concretely classifiable,…
math.DS2026
Wasserstein stability and the nonsingular Borel lifting problem
Nachi Avraham-Re'em, George Peterzil
The Borel lifting problem asks when a nonsingular near action of a Polish group can be represented by a genuine Borel action. For locally compact Polish groups, a classical theorem…