'This book is undoubtedly going to be the definitive book on modal logic for years to come.' M. Vardi, Rice University '... will take you from ground level to one of the best vista points on modal logic today. The authors are expert guides: they know the land from first-hand research experience, but they are committed to taking all newcomers ... Read morethere as well.' Johan van Bentem, University of Amsterdam '... this is an excellent book, targeting a broad audience including logicians, computer scientists, mathematicians and philosophers. It can serve very well both as a graduate textbook, taking a beginner with sufficient logical maturity and interest in the subject well into the expert level, and as a state-of-the-art reference on the main aspects, results, methods, and literature on contemporary modal logic for the experienced researchers. And, much of it can be read just for fun.' Studia Logica This book is undoubtedly going to be the definative book on modal logic for years to come. Moshe Y. Vardi, Rice University Show Less