9-j Symbol
Wigner's 9-j symbols were introduced by Eugene Paul Wigner in 1937. They are related to recoupling coefficients involving four angular momenta
Read more about 9-j Symbol: Recoupling of Four Angular Momentum Vectors, Symmetry Relations, Reduction To 6j Symbols, Special Case, Orthogonality Relation, Asymptotics, 3n-j Symbols
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