http://www.worldscientific.com/worldscibooks/10.1142/1095

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

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