Web Reference: Renormalization in quantum electrodynamics: The simple electron/photon interaction that determines the electron's charge at one renormalization point is revealed to consist of more complicated interactions at another. We review the theory of renormalization, including perturbative renormalization, regularized functional integrals, Renormalization Group and rigorous renormalization. For B 4, any diagram with at least one vertex (so that it is a non-trivial diagram) will be convergent, other than diagrams with a 1-loop correction to a propagator, which are handled by the B = 2 renormalization.
YouTube Excerpt: Modern quantum field theory does not fail because it is wrong. It fails because it produces infinities.
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