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Re:Feynman’s proof of the Maxwell equations by rubidium on Tuesday February 09, 2016 @02:46PM (#11068190)
Griffiths and then Sakurai's quantum mechanics texts should contain what you're trying to recall. They're two I held onto after finishing grad school.
Re:Feynman’s proof of the Maxwell equations by fluxquanta on Tuesday February 09, 2016 @02:50PM (#11068223)
The Griffiths texts for E&M and Quantum were some of the best educational books I've ever read, and unfortunately both were stolen from me as an undergrad.