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Functional derivative

  1. May 9, 2015 #1
    In my textbook (see attached picture) there appears a functional derivative, but I honestly don't know how to evaluate a quantity like this. What should I do? I have tried to google but all I could find was how to take functional derivatives, where polynomials appeared under the integral, while here is an exponential.
     

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  2. jcsd
  3. May 11, 2015 #2

    thierrykauf

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    Gold Member

    You need to google path integrals, Schwinger sources, this is all standard QFT
     
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