## A short course on the application of group theory to quantum mechanics |

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### Contents

Introduction | |

The Theory of Matrix Representations | |

Matrix Representations Cont | |

3 other sections not shown

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### Common terms and phrases

abstract group applied basic symmetry functions basis functions called coefficients column complicated groups components conjugate continuous groups coordinates define the effect definition degeneracy degenerate degenerate energy level denote diagonal dimensional space direct product eigenfunctions energy level equation equivalent example follows form a group functions f group multiplication table group OE group of order group operators Group Theory Hamiltonian Hence Hermitian Hermitian conjugate implies inequivalent invariant irreducible subspaces invariant subspaces inverse irreducible representations isomorphic labeled lectures linear combination linear operators mapping matrix of dimension matrix representations means null matrix OA operators operator OA operators which correspond orthogonality relationships P(Aj perturbation proof quantum mechanics reducible and irreducible respect rotation group scalar product selection rules set of functions set of matrices set of partners similarity transformation space spanned special symmetry functions square matrix statefunctions Suppose symmetry group transform according unit matrix unitary unitary matrix values variables vectors zero