However , the generic Lorentz-invariant form of the matrix element for the electromagnetic current interaction is known , However , the generic Lorentz-invariant form of the matrix element for electromagnetic current interaction is known ,
Walau bagaimanapun, bentuk Lorentz-invarian generik unsur matriks untuk interaksi semasa elektromagnetik dikenali, Walau bagaimanapun, bentuk Lorentz-invarian generik unsur matriks untuk interaksi semasa elektromagnetik dikenali,