目录 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. Groups 4. Modules and representations 5. Irreducible unitary reflection groups 6. Caftan matrices 7. The field of definition Exercises Chapter 2. The groups G(m, p, n) 1. Primitivity and imprimitivity 2. Wreath products and monomial representations 3. Properties of the groups G(m, p, n) 4. The imprimitive unitary reflection groups 5. Imprimitive subgroups of primitive reflection groups 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 groups 1. Poincare series 2. Exterior and symmetric algebras and Moliens Theorem 3. A characterisation of finite reflection groups 4. Exponents Exercises Chapter 5. Quaternions and the finite subgroups of SU2 (C) 1. The quaternions 2. The groups Oa (R) and 04 (R) 3. The groups SU2 (C) and U2 (C) 4. The finite subgroups of the quaternions 5. The finite subgroups of S03 (R) and SU2 (C) 6. Quaternions, reflections and root systems Exercises Chapter 6. Finite unitary reflection groups of rank two 1. The primitive reflection subgroups of U2 (C) 2. The reflection groups of type T 3. The reflection groups of type O 4. The reflection groups 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 groups 6. Line systems for primitive reflection groups 7. The Goethals-Seidel decomposition for 3-systems 8. Extensions of D(2) and Dn(3) 9. Further structure of line systems in Cn 10. Extensions of Euclidean line systems 11. Extensions of.An, gn and Kn in Cn 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 groups 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 special cases of covariants 5. Two-variable Poincar6 series and specialisations Exercises Chapter 11. Eigenspace theory and reflection subquotients 1. Basic affine algebraic geometry 2. Eigenspaces of elements of reflection groups 3. Reflection subquotients of unitary reflection groups 4. Regular elements 5. Properties of the reflection subquotients 6. Eigenvalues of pseudoregular 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 subgroups and the coinvariant algebra 6. Duality groups Exercises Appendix A. Some background in commutative algebra Appendix B. Forms over finite fields 1. Basic definitions 2. Witts Theorem 3. The Wall form, the spinor norm and Dicksons invariant 4. Order formulae 5. Reflections in finite orthogonal groups Appendix C. Applications and further reading 1. The space of regular elements 2. Fundamental groups, braid groups, presentations 3. Hecke algebras 4. Reductive groups over finite fields Appendix D. Tables 1. The primitive unitary reflection groups 2. Degrees and codegrees 3. Cartan matrices 4. Maximal subsystems 5. Reflection cosets Bibliography Index of notation Index 编辑手记
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