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This new expanded second edition has been totally revised and corrected. The reader finds two complete new chapters. One covers the exact solution of the finite

Providing a systematic introduction to the techniques which are fundamental to quantum field theory, this book pays special attention to the use of these techni

This systematic algebraic approach offers a careful formulation of the problems' physical motivations as well as self-contained descriptions of the mathematical

A thorough and pedagogical introduction to phase transitions and exactly solved models in statistical physics and quantum field theory.