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A 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 dΣ/dpslash, 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

    strangerep

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    Science Advisor

    Show your attempt here. (No one can diagnose your problem if you don't show your work.)
     
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