London Algebra Colloquium abstract
Classifying amalgams of linear groups and generalizations
Corneliu Hoffman (Birmingham), 10th February 2011
Abstract
The Curtis–Tits theorem (in its more general form due to Abramenko and
Mühlherr) proves that a Kac–Moody group is the universal completion
of an amalgam of certain small rank Chevalley groups. This amalgam turns
out to be unique in all spherical cases. In general however this is
not the case. This talk describes joint work with R. Blok classifying
such amalgams and applications to expanders.