This book is a modern pedagogic introduction to the ideas and techniques of quantum field theory.
After a brief overview of particle physics and a survey of relativistic wave equations and Lagrangian methods，the quantum theory of scalar and spinor fields， and then of gauge fields，is developed The emphasis throughout is on functional methods，which have played a large part in modern field theory. The book concludes with a brief survey of `topological' objects in field theory and，new to this edition，a chapter devoted to supersymmetry.