Exchange symmetry of two identical spin-one-half fermions
= Exchange symmetry of two identical spin-one-half fermions
For two identical spin-one-half fermions with no additional antisymmetric internal factor, the antisymmetric <spin-one-half singlet state> combines with an even-$\ell$ symmetric orbital state, while the symmetric <spin-one-half triplet state> combines with an odd-$\ell$ antisymmetric orbital state.