The triangle coefficient is function of three variables written and defined by
(Shore and Menzel 1968, p. 273), where is a factorial. It arises for example in the definition of the Wigner 6j-symbol.
The triangle coefficient is function of three variables written and defined by
(Shore and Menzel 1968, p. 273), where is a factorial. It arises for example in the definition of the Wigner 6j-symbol.
Weisstein, Eric W. "Triangle Coefficient." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/TriangleCoefficient.html