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The metal-insulator transition due to electron-electron interactions is one of the most celebrated but least understood problems in condensed matter physics. Here this subject is comprehensively reviewed for the first time since Sir Nevill Mott's monograph of 1990. A pedagogical introduction to the basic concepts for the Mott transition, the Hubbard model, and various analytical approaches to correlated electron systems is presented. A new classification scheme for Mott insulators as Mott-Hubbard and Mott-Heisenberg insulators is proposed. Traditional methods are critically examined for their...

Little do we reliably know about the Mott transition, and we are far from a complete understanding of the metal --insulator transition due to electr- electron interactions. Mott summarized his basic ideas on the subject in his wonderful book Metal--Insulator nansitions that first appeared in 1974 11. 1). In his view, a Motk insulator displays a gap for charge-carrying excitations due to electron cowelations, whose importance is expressed by the presence of local magnetic moments regardless of whether or not they are ordered. Since the subject is far from being settled, different opinions on...

Der Behandlungserfolg nach Unfallen hangt entscheidend von der Qualitat der praklinischen und klinischen Erstversorgung ab. Knapp und pragnant hebt das fur die Kitteltasche des klinischen Assistenten, Notarztes und Rettungsassistenten konzipierte Trauma-Taschenbuch die in dieser Phase wichtigen Schritte hervor; es fuhrt gezielt durch den Katalog diagnostischer Massnahmen und leitet klar und prazise das therapeutische Management ab. Kernelement dieses Taschenbuchs ist die didaktische Aufbereitung, die auch in der Akutsituation eine schnelle Orientierung zulasst."