This book is an introductory graduate-level text on game theory that grew out of courses in mathematics and economics and operations research. Game theory deals with mathematical models of conflict and cooperation. In the first nine chapters, the author covers noncooperative games in extensive and strategic form and some economic applications. Relations with the theory of linear programing and the theory of linear complementarity are indicated. The last chapter treats different types of cooperative games and solution concepts. Discussed are economic applications and applications in OR-situations with multiple agents. The book includes a rich collection of exercises, partly with solutions.