I remember a physics teacher I had in college telling me that... (what follows is obscure but it's what he said)... "If you add all the Feynman diagrams for the electron, the sum, representing its mass, DIVERGE! On the other hand, if you consider only the first few terms of the sum, it matches very well the experimentally measured mass."(adsbygoogle = window.adsbygoogle || []).push({});

Can someone tell me what's true and what's not in what he said and how does one goes from Feynman diagrams to what seems to be (judging by the terms he used) a normal sum ([itex] \Sigma [/itex]).

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# On the electron's mass.

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