In the 60's, the work of Anderson, Chernavski, Kirby and Edwards showed that the group of homeomorphisms of a smooth manifold which are isotopic to the identity

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 D

This book presents the theory of optimal and critical regularities of groups of diffeomorphisms, from the classical work of Denjoy and Herman, up through recent

Given a mathematical structure, one of the basic associated mathematical objects is its automorphism group. The object of this book is to give a biased account