3 papers
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.GT2023
Geometric and arithmetic properties of Löbell polyhedra
Nikolay Bogachev, Sami Douba
The Löbell polyhedra form an infinite family of compact right-angled hyperbolic polyhedra in dimension . We observe, through both elementary and more conceptual means, that the…
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.