Function wigner_symbols::wigner_3jm

pub fn wigner_3jm(
    tj1: i32, 
    tm1: i32, 
    tj2: i32, 
    tm2: i32, 
    tj3: i32, 
    tm3: i32
) -> SignedSqrtRational

Calculates Wigner 3-jm symbols.

⎛j1 j2 j3⎞
⎝m1 m2 m3⎠