9-j Symbol

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

^\frac{1}{2} \begin{Bmatrix} j_1 & j_2 & j_3\\ j_4 & j_5 & j_6\\ j_7 & j_8 & j_9 \end{Bmatrix} = \langle ( (j_1j_2)j_3,(j_4j_5)j_6)j_9 | ((j_1 j_4)j_7,(j_2j_5)j_8)j_9\rangle.

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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