A diagram technique for coupling calculations in compact groups

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Abstract
The well known graphical technique for angular momentum theory is adapted for application in compact groups, including crystal point groups. The adaptation has been kept to a minimum; for simple phase groups, not much modification is called for. Phase conventions and permutation matrices are included by following Butler's (1974) algebraic treatment. Irreducible tensor operators, their conjugate tensors and the analogy with Feynman diagrams are discussed.

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