Did Feynman ever derive the Bragg equation as a particle representation using Feynman diagrams? And where is it available? I spoke to Freeman Dyson and he couldn't recall.
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Did you look at http://birdtracks.eu/ ? Its a massive compendium on feynman diagrams
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$\begingroup$ Thank you, but a search of text doesn't show any Feynman diagram for the Bragg equation. $\endgroup$ – George Pieczenik Jan 29 '12 at 15:37
