This book offers a novel explanation for some of the most puzzbng features of our concept of truth those that generate the Liar Paradox The central thesis of the book is that truth is a circular concept Gupta and Belnap construct a widely applicable theory (the revision theory of definitions) that makes logical sense out of circular or mutually interdependent concepts Under the revision theory, to see truth as circular is to see both its ordinary features and its puzzling features fall into a simple and understandable pattern The Revision Theory of Truth will appeal to a diverse audience Three informal chapters outbne and defend the chief philosophical ideas, two chapters describe and critique the well-known "fixed-point" theory of
truth, and two chapters elaborate the basic mathematical ideas of the revision theory of definitions and truth.