invariance requirement
1.First we assume that there is no spontaneous symmetry broking, starting from the formalism of path integrals and using the gauge invariance requirement, we obtain the Ward-Takahashi identities for the 3-line VIB proper vertex functions and prove that its tensor structure is the same form as that of bare vertex couplings, which indicated the W~± bosons have neither anomalous magnetic moment nor electric quadrupole moment.
