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,

This book, first published in 2000, focuses on developments in the study of geodesic flows on homogenous spaces.

The study of group actions is more than 100 years old but remains a widely studied topic in a variety of mathematic fields. A central development in the last 50

Alexander Reznikov (1960-2003) was a brilliant and highly original mathematician. This book presents 18 articles by prominent mathematicians and is dedicated to

In this partly expository work, a framework is developed for building exotic circle actions of certain classical groups. The authors give general combination th