An introduction to quantum field theory 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 sta 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