wigner-symbols

Calculates Clebsch–Gordan coefficients and Wigner 3-jm, 6-j, and 9-j, and 12-j symbols exactly. They are often used for coupling and recoupling angular momenta in quantum mechanics. Based on the Haskell version of wigner-symbols.

The definition of 12-j symbols is based on the equation (19.3) of the following textbook.

• A. P. Yutsis, I. B. Levinson, and V. V. Vanagas, Mathematical Apparatus of the Theory of Angular Momentum (Israel Program for Scientific Translations, Jerusalem, 1962).