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An Introduction to Quantum Field Theory is a textbook intended for the graduate physics course covering relativistic quantum mechanics, quantum electrodynamics, and Feynman diagrams. The authors make these subjects accessible through carefully worked examples illustrating the technical aspects of the subject, and intuitive explanations of what is going on behind the mathematics. After presenting the basics of quantum electrodynamics, the authors discuss the theory of renormalization and its relation to statistical mechanics, and introduce the renormalization group. This discussion sets the stage for a discussion of the physical principles that underlie the fundamental interactions of elementary particle physics and their description by gauge field theories.

Quantum field theory --- Feynman diagrams --- Renormalization (Physics) --- Gauge fields (Physics) --- Champs, Théorie quantique des --- Feynman, Diagrammes de --- Champs de jauge (physique) --- Quantum field theory. --- Feynman diagrams. --- Relativistic quantum field theory --- Charge and mass renormalization --- Mass and charge renormalization --- Many-body problem --- Matrices --- Quantum theory --- Field theory (Physics) --- Relativity (Physics) --- Electric charge and distribution --- Mass (Physics) --- Physical measurements --- Feynman, Diagrammes de.