Topology, Algebraic Geometry, and Dynamics Seminar (TADS): Combinations of parabolically geometrically finite groups

Speaker:  Brian Udall, Rice University

Title:  Combinations of parabolically geometrically finite groups

Abstract:  We consider the collection of parabolically geometrically finite (PGF) subgroups of mapping class groups, which were defined by Dowdall-Durham-Leininger-Sisto. These are generalizations of convex cocompact groups, and the class of PGF groups contains all finitely generated Veech groups as well as certain free products of multitwist groups. We will see some basic motivations and properties of these groups, as well as discuss a combination theorem for PGF groups generalizing the combination theorem of Leininger-Reid for Veech groups. This allows one to build many more examples of PGF groups, including Leininger-Reid surface groups.

Time:  Friday, January 26, 1:30pm – 2:30pm

Place:  Exploratory Hall, room 4208