Interacting Electrons and Quantum Magnetism (Graduate Texts in Contemporary Physics)
"While there are numerous research monographs..., a simple text introducing budding researchers to the fertile methods has been lacking.  Professor Auerbach's book has been designed to fill this niche, and it is largely successful in this objective...  An excellent feature is a set of exercises at the end of nearly every chapter, which not only lead the student through some of the mathematical steps left out of the text, but also addresses the ramifications of the concepts....  Auerbach's book is an excellent textbook for graduate students starting research in condensed matter theory, and captures well the excitement and creative ferment of the field in recent times. The student who peruses this book with care will be rewarded with a firm grasp of several current techniques, and the discrimination necessary to apply them with sophistication" --Fndns. of Physics