Christopher Cashen – Line Patterns in Free Groups

Carte non disponible

Date/heure
Date(s) - 30/03/2012
11 h 00 min - 12 h 30 min

Catégories Pas de Catégories


I will discuss quasi-isometries of the free group that preserve an equivariant pattern of lines. There is a type of boundary at infinity whose topology determines how flexible such a line pattern is. For sufficiently complicated patterns I use this boundary to define a new metric on the free group with the property that the only pattern preserving quasi-isometries are actually isometries.