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Peskin shroeder quantum field 7.31 pag 221

  1. Apr 1, 2016 #1
    I can't do the derivative 7.31 at page 221. I try to do the derivative of Σ in dp slash, but my result is different from 7.31



    Someone can help me writhing the right derivative?

    Thank you in advance!
     
  2. jcsd
  3. Apr 1, 2016 #2
    Can you elaborate here using the PF format. Also show us first what you've done so far. Thanks.
     
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