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  1. J

    Pauli matrices: tau vs sigma

    In Zee's quantum theory text, introducing the Dirac equation, he states the gamma matrices as direct products of Pauli matrices. The statements involve the identity matrix, sigma matrices, and tau matrices. It took me a bit to realize that the latter were identical. I hadn't seen the tau...
  2. J

    Classical limit from steepest descent

    I'm trying Zee's quantum field theory text as self-study (I'm years out of college) and about 100 pages into it. I can usually get something on the second or third reading. Oddly, one thing that keeps resisting me is quite early. In I.2, he says to apply an appendix on the method of steepest...