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The title and intro read: The Radiation Theories of Tomonaga, Schwinger, and Feynman F. J. DysoN Institute for Adanced Study, Princeton, New Jersey (Received October 6, 1948) A unified development of the subject of quantum electrodynamics is outlined, embodying the main features both of the Tomonaga-Schwinger and of the Feynman radiation theory. The theory is carried to a point further than that reached by these authors, in the dis- cussion of higher order radiative reactions and vacuum polarization phenomena. However, the theory of these higher order processes is a program rather than a definitive theory, since no general proof of the convergence of these effects is attempted. The chief results obtained are (a) a demonstration of the equivalence of the Feynman and Schwinger theories, and (b) a considerable simplification of the procedure involved in applying the Schwinger theory to particular problems, the simplification being the greater the more complicated the problem.

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The title and intro read: The Radiation Theories of Tomonaga, Schwinger, and Feynman F. J. DysoN Institute for Adanced Study, Princeton, New Jersey (Received October 6, 1948) A unified development of the subject of quantum electrodynamics is outlined, embodying the main features both of the Tomonaga-Schwinger and of the Feynman radiation theory. The theory is carried to a point further than that reached by these authors, in the dis- cussion of higher order radiative reactions and vacuum polarization phenomena. However, the theory of these higher order processes is a program rather than a definitive theory, since no general proof of the convergence of these effects is attempted. The chief results obtained are (a) a demonstration of the equivalence of the Feynman and Schwinger theories, and (b) a considerable simplification of the procedure involved in applying the Schwinger theory to particular problems, the simplification being the greater the more complicated the problem.
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Robert McNees (mcnees@mastodon.social)'s status on Thursday, 15-Dec-2022 16:37:47 UTC Robert McNees
in reply to

Dyson was one of the first physicists to really understand the meaning and power of Feynman's diagrammatic approach to QED.
He published a paper in 1949 showing that this method was equivalent to the operator approach of Schwinger & Tomonaga.
Ref: Dyson, Phys. Rev. 75, 486–502

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