wigner_3j( j1 , j2 , j3 , m1 , m2 , m3 )
The Wigner 3-j symbol in SageMath. Related to clebsch_gordan by
\[ \begin{pmatrix} j_1 & j_2 & j_3 \\ m_1 & m_2 & m_3 \end{pmatrix} = \frac{ (-1)^{j_1-j_2-m_3} }{ \sqrt{ 2j_3+1} } \lt j_1 m_1 j_2 m_2 | j_3 -m_3 \gt \]Explicit values:
Related functions: clebsch_gordan
Function category: miscellaneous functions sagemath-docs