Ruth Kellerhals: Hyperbolic Coxeter groups and minimal growth rate

After a short introduction to hyperbolic Coxeter groups of finite covolume and their growth series, we present new results about Coxeter groups acting on hyperbolic 3-space with minimal growth rate. Of special interest are the Coxeter orthoschemes [3,5,3] and [3,3,6]. This is joint work with A. Kolpakov.