This handbook is the fourth volume in a series of volumes devoted to self-contained and up-to-date surveys in the theory of ordinary differential equations, wit

This book presents a new degree theory for maps which commute with a group of symmetries. This degree is no longer a single integer but an element of the group

This monograph explores the concept of the Brouwer degree and its continuing impact on the development of important areas of nonlinear analysis. The authors def