Abstract
The J. Schwinger's formalism of the Green function in the quantum electrodynamics is applied to the transition problem of the state. It is shown that the many body kernel in the Heisenberg representation involves the information about the transition of the state and this is dh'ectly represented by the repeated use of the one body kel'Oel G,@ and the vertex opel'ator rlL defined by J. Schwinger. Further, the renormalization is discussed without use of the usual perturbation theory, although then: remains the difficulty associated with the b-divergence.
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