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math.GR2018★ 14 cited
Product set growth in groups and hyperbolic geometry
Thomas Delzant, Markus Steenbock
Generalising results of Razborov and Safin, and answering a question of Button, we prove that for every hyperbolic group there exists a constant such that for every finite su…
math.GR2008★ 3 cited
Codimension one subgroups and boundaries of hyperbolic groups
Thomas Delzant, Panos Papasoglu
We construct hyperbolic groups with the following properties: The boundary of the group has big dimension, it is separated by a Cantor set and the group does not split. This shows…
math.GR2007
Homomorphic images of Branch groups, and Serre's property (FA)
Thomas Delzant, Rostislav Grigorchuk
It is shown that a finitely generated branch group has Serre's property (FA) if and only if it does not surject onto the infinite cyclic group or the infinite dihedral group. An ex…