3 papers
math.GR2018
Hyperbolic groups that are not commensurably coHopfian
Emily Stark, Daniel J. Woodhouse
Sela proved every torsion-free one-ended hyperbolic group is coHopfian. We prove that there exist torsion-free one-ended hyperbolic groups that are not commensurably coHopfian. In…
math.GR2018
Residually Finite Tubular Groups
Nima Hoda, Daniel T. Wise, Daniel J. Woodhouse
A tubular group is a finite graph of groups with vertex groups and edge groups. We characterize residually finite tubular groups: is residually…
math.GR2018
Revisiting Leighton's Theorem with the Haar Measure
Daniel J. Woodhouse
Leighton's graph covering theorem states that a pair of finite graphs with isomorphic universal covers have a common finite cover. We provide a new proof of Leighton's theorem that…