Robert J. Zimmer is best known in mathematics for the highly influential conjectures and program that bear his name. "Group Actions in Ergodic Theory, Geometry, and Topology: Selected Papers" brings together some of the most significant writings by Z...

In recent years scholars from a variety of branches of mathematics have made several significant developments in the theory of group actions".Groups of Circle Diffeomorphisms" systematically explores group actions on the simplest closed manifold, the...

The study of group actions is more than a hundred years old but remains to this day a vibrant and widely studied topic in a variety of mathematic fields. A central development in the last fifty years is the phenomenon of rigidity, whereby one can cla...