This book provides an introduction to the ergodic theory and topological
dynamics of actions of countable groups. It is organized around the
theme of probabilistic and combinatorial independence, and highlights
the complementary roles of the asymptotic and the perturbative in its
comprehensive treatment of the core concepts of weak mixing,
compactness, entropy, and amenability. The more advanced material
includes Popa's cocycle superrigidity, the Furstenberg-Zimmer structure
theorem, and sofic entropy.
The structure of the book is designed to be flexible enough to serve a
variety of readers. The discussion of dynamics is developed from scratch
assuming some rudimentary functional analysis, measure theory, and
topology, and parts of the text can be used as an introductory course.
Researchers in ergodic theory and related areas will also find the book
valuable as a reference.