On reasoning by default

  • Authors:
  • Raymond Reiter

  • Affiliations:
  • University of British Columbia, Vancouver, B. C., Canada

  • Venue:
  • TINLAP '78 Proceedings of the 1978 workshop on Theoretical issues in natural language processing
  • Year:
  • 1978

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Abstract

This paper surveys a number of kinds of default reasoning in Artificial Intelligence, specifically, default assignments to variables, the closed world assumption, the frame default for causal worlds, exceptions as defaults, and negation in Artificial Intelligence programming languages. Some of these defaults provide clear representational and computaional advantanges over their corresponding first order theories. Finally, the paper discusses various difficulties associated with default theories.