Physics Asked on August 5, 2021
I would like a general method to derive the Feynman rules for any scalar Lagrangian from the generating functional $$Z[J]=int mathcal{D}phi exp left[iS[phi]+iint d^4xJ(x)phi(x)right].$$
There are many examples in the common QFT books (Schwartz, Peskin & Schroeder, Srednicki) but I failed to find a general and comprehensive method.
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