Relevant to philosophy, law, management, and artificial intelligence, these papers explore the applicability of nonmonotonic or defeasible logic to normative reasoning. The resulting systems purport to solve well-known deontic paradoxes and to provide a better treatment than classical deontic logic does of prima facie obligation, conditional obligation, and priorities of normative principles.

Inhalt
Nonmonotonic Foundations for Deontic Logic.- Deontic Logics of Defeasibility.- Systematic Frame Constants in Defeasible Deontic Logic.- The Many Faces of Defeasibility in Defeasible Deontic Logic.- Deontic Logic Viewed as Defeasible Reasoning.- Reasons to Think and Act.- Common Sense Obligation.- Defeasible Reasoning and Moral Dilemmas.- Dyadic Deontic Logic and Contrary-to-Duty Obligations.- Defeasbile Reasoning with Legal Rules.- Apparent Obligation.- A New Approach to Contrary-to-Duty Obligations.- Alchourrón and von Wright on Conflict among Norms.