triqs.operators.util.U_matrix.three_j_symbol
- triqs.operators.util.U_matrix.three_j_symbol(jm1, jm2, jm3)[source]
Calculate the Wigner 3-j symbol.
\[\begin{split}\begin{pmatrix} l_1 & l_2 & l_3\\ m_1 & m_2 & m_3 \end{pmatrix}.\end{split}\]- Parameters:
- jm1tuple of int
\((j_1, m_1)\).
- jm2tuple of int
\((j_2, m_2)\).
- jm3tuple of int
\((j_3, m_3)\).
- Returns:
- float
Value of the 3-j symbol.