triqs.operators.util.U_matrix.three_j_symbol
- triqs.operators.util.U_matrix.three_j_symbol(jm1, jm2, jm3)[source]
Calculate the three-j symbol
\[\begin{split}\begin{pmatrix} l_1 & l_2 & l_3\\ m_1 & m_2 & m_3 \end{pmatrix}.\end{split}\]- Parameters:
jm1 (tuple of integers) – (j_1 m_1)
jm2 (tuple of integers) – (j_2 m_2)
jm3 (tuple of integers) – (j_3 m_3)
- Returns:
three_j_sym – Three-j symbol.
- Return type:
scalar