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Does a symmetry of Lagrangian be reserved in each Feynman diagram of perturbative QFT,because even Ward Identity still deduces from U(1) symmetry that we consider each diagram has?.

By the way, does effective action reserve the symmetry that Lagrangian has?.

Thank you very much for your kind helping.

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# Does a symmetry of Lagrangian reserve in each Feynman diagram?

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