quantum field theory - Wick's theorem and Feynman propagator

(this is the image from book 'No nonsense QFT' by Jakob Schwichtenberg, page no, 426) The quantity $[\phi_-(x),\phi_+(y)]$ is like an operator inside the bra-kets $\langle 0|$ and $|0\rangle$. I'm

PART VII.3 - Quantum Electrodynamics

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Wick theorem in QFT for the Gifted Amateur

Quantum field theory 1, lecture 16 - Floerchinger group

IOPP: Title Detail: Relativistic Quantum Field Theory, Volume 1 by

The art of Schwinger and Feynman parametrizations

Where Are the Poles of the Integrand for Δ<0 in Wick Rotation?

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On which propagator does the field self-contraction loop go on

PDF) Lecture Notes on QFT Dr. J. M. Ashfaque (MInstP, MAAT

Quantum field theory 1, lecture 16 - Floerchinger group

Feynman diagrams potentially contributing to the propagator in