Coxeter groups, Lorentzian lattices, and K3 surfaces
Richard E. Borcherds
math.GRarXiv:math/9806141
Abstract
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.
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