In Feynman's 1961 Quantum Electrodynamics (p 136ff) would it make sense, when considering a bound electron, to ask if the phase correction can be limited to 0 to 360 degrees of correction - like wrapping a path around a "Bohr Orbit" so it lines up nicely, rather than considering any Interval during which the virtual photon might exist ? Or is Feynman's view forced by perturbation theory or S matrix issues ?
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