Recent Results on Complementarity Problems

In the last few years a number of important results have taken place dealing with the Complementarity Problem, linear and nonlinear. Mainly, there have been results dealing with existence and uniqueness; with classes of matrices in the linear case; and with generalizations of the problem. In this paper, an attempt is made to summarize these results, and to bring them together into a comprehensive whole in a manner as to suggest areas of further concentration.