This volume reviews some selected problems in solid state physics with an emphasis on adequate mathematical tools. The three main subjects are magnetic structur

This volume continues the series of proceedings of summer schools on theoretical physics which aim at an adequate description of the structure of condensed matt

This volume continues the series of proceedings of summer schools on theoretical physics related to various aspects of the structure of condensed matter, and to

This volume continues the series of proceedings of summer schools on theoretical physics related to various aspects of the structure of condensed matter, and to

This volume is the seventh in a series of proceedings on theoretical physics related to various aspects of the structure of condensed matter and to appropriate