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For questions involving the Lagrangian formulation of a dynamical system. Namely, the application of an action principle to a suitably chosen Lagrangian or Lagrangian Density in order to obtain the equations of motion of the system.

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In my Quantum Field Theory course, I am having some trouble with the derivation of the Feynman rules from a Lagrangian. While I am confident I can get it under control by the time the exams come aroun …
asked Dec 10 '16 by Drubbels