Precedent, deontic logic, and inheritance

  • Authors:
  • John F. Horty

  • Affiliations:
  • Philosophy Department and Institute for Advanced Computer Studies, University of Maryland, College Park, MD

  • Venue:
  • ICAIL '99 Proceedings of the 7th international conference on Artificial intelligence and law
  • Year:
  • 1999

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Abstract

The purpose of this paper is to establish some connections between precedent-based reasoning as it is studied in the field of Artificial Intelligence and Law, particularly in the work of Ashley, and two other fields: deontic logic and nonmonotonic logic. First, a deontic logic is described that allows for sensible reasoning in the presence of conflicting norms. Second, a simplified version of Ashley's account of precedent-based reasoning is reformulated within the framework of this deontic logic. Finally, some ideas from the theory of nonmonotonic inheritance are employed to show how Ashley's account might be elaborated to allow for a richer representation of the process of argumentation.