This book shows how densities arise in simple deterministic systems.
There has been explosive growth in interest in physical, biological and
economic systems that can be profitably studied using densities. Due to
the inaccessibility of the mathematical literature there has been little
diffusion of the applicable mathematics into the study of these
'chaotic' systems. This book will help to bridge that gap. The authors
give a unified treatment of a variety of mathematical systems generating
densities, ranging from one-dimensional discrete time transformations
through continuous time systems described by integro-partial
differential equations. They have drawn examples from many scientific
fields to illustrate the utility of the techniques presented. The book
assumes a knowledge of advanced calculus and differential equations, but
basic concepts from measure theory, ergodic theory, the geometry of
manifolds, partial differential equations, probability theory and Markov
processes, and stochastic integrals and differential equations are
introduced as needed.