Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.

    Attached Files:

  2. jcsd
  3. May 11, 2015 #2


    User Avatar
    Gold Member

    You need to google path integrals, Schwinger sources, this is all standard QFT
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Functional derivative
  1. Functional derivatives (Replies: 1)

  2. Functional derivation (Replies: 1)

  3. Functional derivative (Replies: 1)