This book is aimed at mathematicians interested in such topics as
ergodic theory, topological dynamics, constructive quantum field theory,
the study of certain differentiable dynamical systems, notably Anosov
diffeomorphisms and flows. It is also of interest to theoretical
physicists concerned with the conceptual basis of equilibrium
statistical mechanics. The level of the presentation is generally an
advanced one, with the objective of providing an efficient research tool
and a text for use in graduate teaching.