С другой сторны «Dyson is best known[citation needed] for demonstrating in 1949 the equivalence of the formulations of quantum electrodynamics that existed by that time — Richard Feynman's diagrammatic path integral formulation and the operator method developed by Julian Schwinger and Sin-Itiro Tomonaga. A by-product of that demonstration was the invention of the Dyson series.[7]»
http://en.wikipedia.org/wiki/Freeman_Dyson

Silvan S. Schweber в своей замечательной книге QED and the Men Who Made it: Dyson, Feynmann, Schwinger and Tomonaga пишет (p. 575):
“For reason that are not entirely clear, Dyson’s achievement was not rewarded by the community. Some have suggested that his contributions were primarily mathematical; others have noted that his proof of the renormalizability of the S-matrix in quantum electrodynamics was incomplete – that the full prescription for the correct handing of overlapping diverges was formulated by Salam (1950) and that the rigorous proof of the counting theorem and of the renormalizability of QED were given later by Weinberg (1959), Hepp (1966), and others.”

Но ведь работы Хофта и Велтмана – это тоже, в основном, математика, а не физика, и перенормировка вайнберговской модели заслуга не одних Хофта и Велтмана…