Complementarity theory, a relatively new domain in applied mathematics,
has deep connections with several aspects of fundamental mathematics and
also has many applications in optimization, economics and engineering.
The study of variational inequalities is another domain of applied
mathematics with many applications to the study of certain problems with
unilateral conditions. This book is the first to discuss complementarity
theory and variational inequalities using Leray-Schauder type
alternatives. The ideas and method presented in this book may be
considered as a starting point for new developments.