From the Preface: The purpose of this book is to present and apply a language and to discuss methods which make it very convenient to exploit such analogies, and which are uniquely suited to describe and explain non-equilibrium phenomena in a rich variety of many-particle systems: the language of time correlation functions and linear response theory. * Publishers Foreword * Editors Foreword * Introduction * A Simple ExampleSpin Diffusion * Formal Properties of Correlation Functions * The Normal Fluid * The Memory Function Formalism * Brownian Motion * Broken Symmetry * Hydrodynamic Spin Waves in Ferromagnets * Hydrodynamic Spin Waves in Antiferromagnets * Superfluids * Nematic Liquid Crystals * SuperconductorsDieter Forster