Abstract
This is a straightforward discourse that starts with a radio antenna and winds up with the propagator for Dirac particles. From the radio antenna we obtain the physical idea of a propagator and show its nature for Klein-Gordon particles (with photons as a special case). Then, from the Klein-Gordon propagator we easily obtain the propagator for Dirac particles, merely by imposing what might be called the “Dirac condition.” We hope the approach has simplicity and physical appeal.
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