1.Fundamentlas 1.1 Introduction 1.2 The Basic Hamiltonian 1.3 The Hartrce-Fock Approximation 2.The One-Electron Approximation 2.1 The Electron Gas Without Interaction 2.2 Electrons in a Periodic Potential 3. Elementary Exciations 3.1 The Interacting Electron Gas:Quasi-Electrons and Plasmons 3.2 Electron-Hole Intereacion in Semiconduction and Insulators:Excitons 3.3 Ion-Ion Interaction:Phonons 3.4 Spin-Spin Interaction:Magnons 4.Elctron-Phonon Interaction:Transport Phenomena 4.1 The Interaction Processes 4.2 The Boltzmann Equation 4.3 Formal Transpor Theory 4.4 Transport in Metals and Semiconductors 5.Electron-Electron Interation by Exchange of Virtual Phonons:Supeconductivity 5.1 Introduction 5.2 Cooper Pairs 5.3 The Ground State of the Superconducting Electron Gas 5.4 Excited States 5.5 Comparison with Experiment 5.6 The Meissner-Ochsenfeld Effect 5.7 Further Theortical COncepts 6.Interaction with photons:Optics 7.Phtonon-Phonon Interaction:Thermal Properties 8.Local Description of Solid-State Properties 9.Localized Sates 10.Disorder Appendix:The Occupation Number Representation Problmes to Chapter1-1 Biblioography Subject Index