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Basic Concepts 1
Definitions 1
Lie Algebras 1
Change of Basis 3
Complex Extensions 4
Lie Subalgebras 4
Abelian Algebras 5
Direct Sum 5
Ideals (Invariant Subalgebras) 6
Semisimple Algebras 7
Semidirect Sum 7
Killing Form 8
Compact and Non-Compact Algebras 9
Derivations 9
Nilpotent Algebras 10
Invariant Casimir Operators 10
Invariant Operators for Non-Semisimple Algebras 12
Structure of Lie Algebras 12
Algebras with One Element 12
Algebras with Two Elements 12
Algebras with Three Elements 13
Semisimple Lie Algebras 15
Cartan-Weyl Form of a (Complex) Semisimple Lie Algebra 15
Graphical Representation of Root Vectors 15
Explicit Construction of the Cartan-Weyl Form 17
Dynkin Diagrams 19
Classification of (Complex) Semisimple Lie Algebras 21
Real Forms of Complex Semisimple Lie Algebras 21
Isomorphisms of ComplexSemisimple Lie Algebras 21
Isomorphisms of Real Lie Algebras 22
Enveloping Algebra 23
Realizations of Lie Algebras 23
Other Realizations of Lie Algebras 24
Lie Groups 27
Groups of Transformations 27
Groups of Matrices 27
Properties of Matrices 28
Continuous Matrix Groups 29
Examples of Groups of Transformations 32
The Rotation Group in Two Dimensions, SO(2) 32
The Lorentz Group in One Plus One Dimension, 50(1,1) 33
The Rotation Group in Three Dimensions 34
The Special Unitary Group in Two Dimensions, SU(2) 34
Relation Between SO(3) and SU(2) 35
Lie Algebras and Lie Groups 37
The Exponential Map 37
Definition of Exp 37
Matrix Exponentials 38
Irreducible Bases (Representations) 39
Definitions 39
Abstract Characterization 39
Irreducible Tensors 40
Irreducible Tensors with Respect to GL(n) 40
Irreducible Tensors with Respect to SU(n) 41
Irreducible Tensors with Respect to O(n). Contractions 41
Tensor Representations of Classical Compact Algebras 42
Unitary Algebras u(n) 42
Special Unitary Algebras su(n) 42
Orthogonal Algebras so(n), n = Odd 43
Orthogonal Algebras so(n), n = Even 43
Symplectic Algebras sp(n), n = Even 43
Spinor Representations 44
Orthogonal Algebras so(n), n = Odd 44
Orthogonal Algebras so(n), n = Even 44
Fundamental Representations 45
Unitary Algebras 45
Special Unitary Algebras 45
Orthogonal Algebras, n = Odd 45
Orthogonal Algebras, n = Even 46
Symplectic Algebras 46
Chains of Algebras 46
Canonical Chains 46
Unitary Algebras 47
Orthogonal Algebras 48
Isomorphisms of Spinor Algebras 49
Nomenclature for u(n) 50
Dimensions of the Representations 50
Dimensions of the Representations of u(n) 51
Dimensions of the Representations of su(n) 52
Dimensions of the Representations of A[subscript n] = su(n + 1) 52
Dimensions of the Representations of B[subscript n] = so(2n + 1) 52
Dimensions of the Representations of C[subscript n] = sp(2n) 53
Dimensions of the Representations of D[subscript n] = so(2n) 53
Action of the Elements of g on the Basis B 53
Tensor Products 56
Non-Canonical Chains 58
Casimir Operators and Their Eigenvalues 63
Definitions 63
Independent Casimir Operators 63
Casimir Operators of u(n) 63
Casimir Operators of su(n) 64
Casimir Operators of so(n), n = Odd 64
Casimir Operators of so(n), n = Even 64
Casimir Operators of sp(n), n = Even 65
Casimir Operators of the Exceptional Algebras 65
Complete Set of Commuting Operators 65
The Unitary Algebra u(n) 66
The Orthogonal Algebra so(n), n = Odd 66
The Orthogonal Algebra so(n), n = Even 66
Eigenvalues of Casimir Operators 66
The Algebras u(n) and su(n) 67
The Orthogonal Algebra so(2n + 1) 69
The Symplectic Algebra sp(2n) 71
The Orthogonal Algebra so(2n) 72
Eigenvalues of Casimir Operators of Order One and Two 74
Tensor Operators 75
Definitions 75
Coupling Coefficients 76
Wigner-Eckart Theorem 77
Nested Algebras. Racah's Factorization Lemma 79
Adjoint Operators 81
Recoupling Coefficients 83
Symmetry Properties of Coupling Coefficients 84
How to Compute Coupling Coefficients 85
How to Compute Recoupling Coefficients 86
Properties of Recoupling Coefficients 86
Double Recoupling Coefficients 87
Coupled Tensor Operators 88
Reduction Formula of the First Kind 88
Reduction Formula of the Second Kind 89
Boson Realizations 91
Boson Operators 91
The Unitary Algebra u(1) 92
The Algebras u(2) and su(2) 93
Subalgebra Chains 93
The Algebras u(n), n [GreaterEqual]3 97
Racah Form 97
Tensor Coupled Form of the Commutators 98
Subalgebra Chains Containing so(3) 99
The Algebras u(3) and su(3) 99
Subalgebra Chains 100
Lattice of Algebras 103
Boson Calculus of u(3) [Superset] so(3) 103
Matrix Elements of Operators in u(3) [Superset] so(3) 105
Tensor Calculus of u(3) [Superset] so(3) 106
Other Boson Constructions of u(3) 107
The Unitary Algebra u(4) 108
Subalgebra Chains not Containing so(3) 109
Subalgebra Chains Containing so(3) 109
The Unitary Algebra u(6) 115
Subalgebra Chains not Containing so(3) 115
Subalgebra Chains Containing so(3) 115
The Unitary Algebra u(7) 123
Subalgebra Chain Containing g[subscript 2] 124
The Triplet Chains 125
Fermion Realizations 131
Fermion Operators 131
Lie Algebras Constructed with Fermion Operators 131
Racah Form 132
The Algebras u(2j + 1) 133
Subalgebra Chain Containing spin(3) 134
The Algebras u(2) and su(2). Spinors 134
The Algebra u(4) 136
The Algebra u(6) 137
The Algebra u ([Sum][subscript i] (2j[subscript i] + 1)) 138
Internal Degrees of Freedom (Different Spaces) 139
The Algebras u(4) and su(4) 139
The Algebras u(6) and su(6) 141
Internal Degrees of Freedom (Same Space) 142
The Algebra u((2l + 1)(2s + 1)): L-S Coupling 142
The Algebra u ([Sum][subscript j] (2j + 1)): j-j Coupling 145
The Algebra u(([Sum][subscript l](2l + 1)) (2s + 1)): Mixed L-S Configurations 146
Differential Realizations 147
Differential Operators 147
Unitary Algebras u(n) 147
Orthogonal Algebras so(n) 148
Casimir Operators. Laplace-Beltrami Form 150
Basis for the Representations 151
Orthogonal Algebras so(n, m) 152
Symplectic Algebras sp(2n) 153
Matrix Realizations 155
Matrices 155
Unitary Algebras u(n) 155
Orthogonal Algebras so(n) 158
Symplectic Algebras sp(2n) 159
Basis for the Representation 160
Casimir Operators 161
Spectrum Generating Algebras and Dynamic Symmetries 163
Spectrum Generating Algebras (SGA) 163
Dynamic Symmetries (DS) 163
Bosonic Systems 164
Dynamic Symmetries of u(4) 165
Dynamic Symmetries of u(6) 167
Fermionic Systems 170
Dynamic Symmetry of u(4) 170
Dynamic Symmetry of u(6) 171
Degeneracy Algebras and Dynamical Algebras 173
Degeneracy Algebras 173
Degeneracy Algebras in v [GreaterEqual] 2 Dimensions 173
The Isotropic Harmonic Oscillator 174
The Coulomb Problem 177
Degeneracy Algebra in v = 1 Dimension 181
Dynamical Algebras 182
Dynamical Algebras in v [GreaterEqual] 2 Dimensions 182
Harmonic Oscillator 182
Coulomb Problem 182
Dynamical Algebra in v = 1 Dimension 183
Poschl-Teller Potential 183
Morse Potential 185
Lattice of Algebras 187
References 189
Index 193
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