Coxeter groups, Lorentzian lattices, and K3 surfaces
Abstract
Description
The main result of this paper describes the normalizer of a finite parabolic subgroup of a (possibly infinite) Coxeter group. We use this to compute the automorphism groups of some Lorentzian lattices and K3 surfaces.
16 pages, plain tex. References added, minor errors corrected
16 pages, plain tex. References added, minor errors corrected