|Emerging Topics working group|
|Topic:||Coherence, planar boundaries, and the geometry of subgroups|
|Date:||Tuesday, March 26|
|Time/Room:||11:00am - 12:00pm/West Building Lecture Hall|
Abstract: This will be a broad talk about coherence of groups, and how it relates to conjectures about hyperbolic groups with planar boundaries. A group is coherent if every finitely generated subgroup is finitely presented. This is a property enjoyed by the fundamental groups of 3-manifolds. A natural stepping stone to proving that certain hyperbolic groups are 3-manifold groups is to prove that they are coherent. A stronger property that some hyperbolic groups possess is "local quasi-convexity", in that every finitely generated subgroup is quasi-convex. It is conjectured that a hyperbolic group whose Gromov boundary is a Sierpinski carpet is locally quasi-convex. I'll also discuss several examples of coherent and incoherent groups that have 3-manifold like properties.