This volume is concerned with the theoretical description of patterns
and instabilities and their relevance to physics, chemistry, and
biology. More specifically, the theme of the work is the theory of
nonlinear physical systems with emphasis on the mechanisms leading to
the appearance of regular patterns of ordered behavior and chaotic
patterns of stochastic behavior. The aim is to present basic concepts
and current problems from a variety of points of view. In spite of the
emphasis on concepts, some effort has been made to bring together
experimental observations and theoretical mechanisms to provide a basic
understanding of the aspects of the behavior of nonlinear systems which
have a measure of generality. Chaos theory has become a real challenge
to physicists with very different interests and also in many other
disciplines, of which astronomy, chemistry, medicine, meteorology,
economics, and social theory are already embraced at the time of
writing. The study of chaos-related phenomena has a truly
interdisciplinary charac- ter and makes use of important concepts and
methods from other disciplines. As one important example, for the
description of chaotic structures the branch of mathematics called
fractal geometry (associated particularly with the name of Mandelbrot)
has proved invaluable. For the discussion of the richness of ordered
structures which appear, one relies on the theory of pattern
recognition. It is relevant to mention that, to date, computer studies
have greatly aided the analysis of theoretical models describing chaos.