Where fail-safe default logics fail

  • Authors:
  • Paolo Liberatore

  • Affiliations:
  • Università di Roma “La Sapienza”, Roma, Italy

  • Venue:
  • ACM Transactions on Computational Logic (TOCL)
  • Year:
  • 2007

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Abstract

Reiter's original definition of default logic allows for the application of a default that contradicts one previously applied. We call this condition failure. The possibility of generating failures has been in the past considered a semantical problem, and variants have been proposed to solve it. We show that it is instead a computational feature that is needed to encode some domains into default logic.