Showing math.GRShow all
3 papers · 1 filter
math.GR2023
On regular subgroups of
Sami Douba, Konstantinos Tsouvalas
Motivated by a question of M. Kapovich, we show that the subgroups of that are regular in the language of Kapovich--Leeb--Porti, or diver…
math.GR2023
A novel witness to incoherence of
Sami Douba
Motivated by a question of Stover, we discuss an example of a Zariski-dense finitely generated subgroup of that is not finitely presented.
math.GR2022
A hyperbolic lattice in each dimension with Zariski-dense surface subgroups
Sami Douba
For each integer , we exhibit a nonuniform arithmetic lattice in containing Zariski-dense surface subgroups.