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Renormalization
A full lecture reconstruction showing how loop divergences arise in perturbative QED, why only three classes of divergent loop integrals survive, and how their effects can be absorbed into mass, charge, and field-strength renormalization.
Introduction
This lecture is where perturbative QED stops being just a clever method and starts confronting its main conceptual difficulty.
The previous lecture showed that QED scattering amplitudes can be computed from a Lorent