
School of Mathematics and Statistics
Bob Howlett
University of Sydney
Automorphisms of Coxeter groups.
Friday 12th May, 121pm, Carslaw 175.
Apart from the symmetric group on 6 letters,
I don't know of any Coxeter group that has an interesting
outer automorphism. In this talk I shall survey what I
know about outer automorphisms of Coxeter groups, and
outline a proof of the following fact: if W is an infinite
rank 3 Coxeter group whose Coxeter graph contains no
infinite bonds then the automorphism group of W is
generated by graph automorphisms and inner automorphisms.
