When the contribution ofthe straton loop diagrams is neglected the kernels of the transition matrix elementsof the electromagnetic current can be computed,from the kernels of B-S equation byusing the retations given by Ward Identities.

• 文中在不考虑封闭的层子线圈图的贡献时；用华德等式给出的关系可从贝特-沙尔披特方程的积分核将电流跃迁矩阵元的积分核算出来.