6-j Symbol
Wigner's 6-j symbols were introduced by Eugene Paul Wigner in 1940, and published in 1965. They are defined by a sum over products of four 3jm symbols,
with phase . The summation is over all six mi, effectively confined by the selection rules of the 3jm symbols. They are related to Racah's W-coefficients by
They have higher symmetry than Racah's W-coefficients.
Read more about 6-j Symbol: Symmetry Relations, Special Case, Orthogonality Relation, Asymptotics
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