Dialetheism is the view that some contradictions are true. This is a view which runs against orthodoxy in logic and metaphysics since Aristotle, and has implications for many of the core notions of philosophy. Doubt Truth to Be a Liar explores these implications for truth, rationality, negation, and the nature of logic, and develops further the defense of dialetheism first mounted in Priest's In Contradiction, a second edition of which is also available.
1Aristotle on the law of non-contradiction72Theories of truth433Trivialism564Contradiction755Boolean negation886Denial and rejection1037Rational belief1198Belief revision1309Consistency and the empirical sciences14210Logic and revisability15511Validity17612Logical pluralism194