 QED Feynman rules (source code)

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= QED Feynman rules
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The <QED Feynman rules> combine the <Dirac propagator>, <photon propagator>, and vertex $-ie\gamma^\mu$ with external <Dirac spinors> and <photon polarization vectors>. In a <covariant gauge> they generate perturbative electron-photon scattering amplitudes.

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