introduction 1. overview of this book 2. some detail concerning the content 3. acknowledgements 4. leitfaden chapter 1. preliminaries 1. hermitian forms 2. reflections 3. grou 4. modules and representations 5. irreducible unitary reflection grou 6. caftan matrices 7. the field of definition exercises chapter 2. the grou g(m, p, n) 1. primitivity and imprimitivity 2. wreath products and monomial representations 3. properties of the grou g(m, p, n) 4. the imprimitive unitary reflection grou 5. imprimitive subgrou of primitive reflection grou 6. root systems for g(m, p, n) 7. generators for g(m, p, n) 8. invariant polynomials for g(m,p, n) exercises chapter 3. polynomial invariants 1. tensor and symmetric algebras 2. the algebra of invariants 3. invariants of a finite group 4. the action of a reflection 5. the shephard-todd--chevalley theorem 6. the coinvariant algebra exercises chapter 4. poincare series and characterisations of reflection grou 1. poincare series 2. exterior and symmetric algebras and moliens theorem 3. a characterisation of finite reflection grou 4. exponents exercises chapter 5. quaternions and the finite subgrou of su2 (c) 1. the quaternions 2. the grou oa (r) and 04 (r) 3. the grou su2 (c) and u2 (c) 4. the finite subgrou of the quaternions 5. the finite subgrou of s03 (r) and su2 (c) 6. quaternions, reflections and root systems exercises chapter 6. finite unitary reflection grou of rank two 1. the primitive reflection subgrou of u2 (c) 2. the reflection grou of type t 3. the reflection grou of type o 4. the reflection grou of type i 5. cartan matrices and the ring of definition 6. invariants exercises chapter 7. line systems 1. bounds online systems 2. star-closed euclidean line systems 3. reflections and star-closed line systems 4. extensions of line systems 5. line systems for imprimitive reflection grou 6. line systems for primitive reflection grou 7. the goethals-seidel deition for 3-systems 8. extensions of d(2) and dn(3) 9. further structure of line systems in 10. extensions of euclidean line systems 11. extensions of.an, gn and kn in 12. extensions of 4-systems exercises chapter 8. the shephard and todd classification 1. outline of the classification 2. blichfeldts theorem 3. consequences of blichfeldts theorem 4. extensions of 5-systems 5. line systems and reflections of order three 6. extensions of ternary 6-systems 7. the classification 8. root systems and the ring of definition 9. reduction modulo p 10. identification of the primitive reflection grou exercises chapter 9. the orbit map, harmonic polynomials and semi-invariants 1. the orbit map 2. skew invariants and the jacobian 3. the rank of the jacobian 4. semi-invariants 5. differential operators 6. the space of g-harmonic polynomials 7. steinbergs fixed point theorem exercises chapter 10. covariants and related polynomial identities 1. the space of covariants 2. gutkins theorem 3. differential invariants 4. some spe cases of covariants 5. two-variable poincar6 series and speisations exercises chapter 11. eigenspace theory and reflection subquotients 1. basic affine algebraic geometry 2. eigenspaces of elements of reflection grou 3. reflection subquotients of unitary reflection grou 4. regular elements 5. properties of the reflection subquotients 6. eigenvalues of eudoregular elements chapter 12. reflection cosets and twisted invariant theory 1. reflection cosets 2. twisted invariant theory 3. eigenspace theory for reflection cosets 4. subquotients and centralisers 5. parabolic subgrou and the coinvariant algebra 6. duality grou exercises appendix a. some backgrou
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