collaborators

2 papers

math.GR2025

Higher-rank GBS groups: non-positive curvature and biautomaticity

Sam Shepherd, Motiejus Valiunas

We characterise when a rank generalised Baumslag-Solitar group is CAT(0) and when it is biautomatic.

math.GR2024

Product separability for special cube complexes

Sam Shepherd

We prove that if a group admits a virtually special action on a CAT(0) cube complex, then any product of convex-cocompact subgroups of is separable. Previously, this was on…