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Problem to derive the KG propagator

  1. Aug 31, 2015 #1
    1. The problem statement, all variables and given/known data
    I'm using the text-book Student Friendly Quantum Field Theory [Robert D. Klauber] and I don't know how to get the function (k0) (3-134) present in the figure below.
    http://[url=http://postimg.org/image/5j62c27nz/][PLAIN]http://s11.postimg.org/5j62c27nz/help.jpg [Broken]


    Does someone has an hint to find this function??
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Aug 31, 2015 #2
    The problem was solved. How do I remove this post from the forum?
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