### What is the identity operator in quantum field theory?

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“What does the identity operator look like in Quantum Field Theory?”

https://physics.stackexchange.com/q/383467

The answer gives a nice derivation of functional integrals and actions in quantum field theory.

https://physics.stackexchange.com/q/383467

The answer gives a nice derivation of functional integrals and actions in quantum field theory.

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