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Greens function path integral representation

  1. May 9, 2015 #1
    In my book the path integral representation of the green's function is given as that on the attached picture. But how do you go from the usual trace formula for the Green's function 2.6 to this equation?
     

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  2. jcsd
  3. May 9, 2015 #2

    vanhees71

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