"... a lively pedagogical exposition of the Keldysh technique based on functional integration. At the start, the author uses the simplest possible system - a harmonic oscillator - to provide a detailed description of the method... a welcome introduction to the field and could well become a classic."
Vojkan Jaksic, McGill University for Physics Today
A self-contained presentation of the modern functional approach to non-equilibrium field-theoretical methods, this book gives a step-by-step treatment of the subject, with particular emphasis to the pedagogical aspects. It is an ideal reference for advanced graduate students and researchers in condensed matter physics.