Table of Contents

Ch. IV. Coxeter Groups and Tits Systems: Coxeter Groups. Tits Systems.- Ch. V. Groups Generated by Reflections: Hyperplanes, Chambers and Facets. Reflections. Groups of Displacements Generated by Reflections. The Geometric Representation of a Coxeter Group. Invariants in the Symmetric Algebra. The Coxeter Transformation.- Ch. VI. Root Systems: Root Systems. Affine Weyl Group. Exponential Invariants. Classification of Root Systems.- Historical Note.