On specificity in default logic

  • Authors:
  • Jussi Rintanen

  • Affiliations:
  • Department of Computer Science, Helsinki University of Technology, Espoo, Finland

  • Venue:
  • IJCAI'95 Proceedings of the 14th international joint conference on Artificial intelligence - Volume 2
  • Year:
  • 1995

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Abstract

The applicability of lexicographic comparison in nonmonotonic reasoning with specificity is investigated. A priority mechanism based on lexicographic comparison is defined for Rciter's default logic. The following principle - earlier used by Geffner and Pearl in conditional entailment - is used as the basis for specificity-based priorities for normal default theories for each rule there is a context where it may not be defeated by any other rule. A method for computing priorities according to the principle is given Connection to earlier work is discussed.