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Feynman Diagrams on Srednicki's book.

  1. Jul 29, 2011 #1
    I am reading Srednicki's Quantum Field Theory recently. I have thought over the descriptions of the Feynman Diagrams on his book in chapter 9, but I still can not understand what these diagrams mean and how do they help us to calculate the right-hand side of the equation 9.11 on the book. Is there anyone who can help me?
    See http://web.physics.ucsb.edu/~mark/ms-qft-DRAFT.pdf, page 73. And the equation 9.11 is on page 72.
    Thanks for your help.
     
  2. jcsd
  3. Jul 29, 2011 #2
    read on till feynman rules if anything isn't clear come back
     
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