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VOLUME 20 (1974) | ISSUE 2 | PAGE 135
Diagonality of the electron mass operators in a constant field
On the basis of arguments of general character, a proof is presented of the diagonality of the exact (outside the framework of perturbation theory with respect to external and radiation fields) mass operator of an electron in a constant electromagnetic field. The diagonality of the mass operator radically simplifies the study of radiation effects in an external field and reduces the integro-differential equations for the wave function and for the exact Green's function to algebraic equations.