Dealing with logical omniscience: Expressiveness and pragmatics

  • Authors:
  • Joseph Y. Halpern;Riccardo Pucella

  • Affiliations:
  • Cornell University, Ithaca, NY 14853, USA;Northeastern University, Boston, MA 02115, USA

  • Venue:
  • Artificial Intelligence
  • Year:
  • 2011

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Abstract

We examine four approaches for dealing with the logical omniscience problem and their potential applicability: the syntactic approach, awareness, algorithmic knowledge, and impossible possible worlds. Although in some settings these approaches are equi-expressive and can capture all epistemic states, in other settings of interest (especially with probability in the picture), we show that they are not equi-expressive. We then consider the pragmatics of dealing with logical omniscience-how to choose an approach and construct an appropriate model.