Wigner 6j 符号

贡献者： addis

预备知识　Wigner 3j 符号

　　定义

\begin{matrix} (1) & \begin{aligned} {\begin{array}{c} j_{1} & j_{2} & j_{3} \\ j_{4} & j_{5} & j_{6} \end{array}} = \sum_{m_{1}, \dots, m_{6}} (- 1)^{\sum_{k = 1}^{6} (j_{k} - m_{k})} (\begin{array}{c} j_{1} & j_{2} & j_{3} \\ - m_{1} & - m_{2} & - m_{3} \end{array}) \times \\ (\begin{array}{c} j_{1} & j_{5} & j_{6} \\ m_{1} & - m_{5} & m_{6} \end{array}) (\begin{array}{c} j_{4} & j_{2} & j_{6} \\ m_{4} & m_{2} & - m_{6} \end{array}) (\begin{array}{c} j_{4} & j_{5} & j_{3} \\ - m_{4} & m_{5} & m_{3} \end{array}) . \end{aligned} \end{matrix}