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In what paper did Dyson derive the Dyson equation, as shown on Wikipedia?

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    $\begingroup$ Not sure but see F. Dyson: The S Matrix in Quantum Electrodynamics. Phys. Rev.. 75, (1949), p.1736. doi:10.1103/PhysRev.75.1736. $\endgroup$
    – sand1
    Commented Sep 24, 2020 at 16:55

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It is equation (63) in his epochal second paper, Dyson, F J (1949). "The S matrix in quantum electrodynamics", Phys Rev 75 (11), 1736.

He refers to his first one, but the systematics in momentum space of the reducible self energy Σ are there.

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