Reasoning under inconsistency: the forgotten connective

  • Authors:
  • Sébastien Konieczny;Jérôme Lang;Pierre Marquis

  • Affiliations:
  • CRIL, Université d'Artois, Lens, France;IRIT, Université Paul Sabatier, Toulouse, France;CRIL, Université d'Artois, Lens, France

  • Venue:
  • IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
  • Year:
  • 2005

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Abstract

In many frameworks for reasoning under inconsistency, it is implicitly assumed that the formulae from the belief base are connected using a weak form of conjunction. When it is consistent, a belief base B = {φ1..., φn}, where the φi are propositional formulae, is logically equivalent to the base {φ1 Λ ... Λ φn}. However, when it is not consistent, both bases typically lead to different conclusions. This illustrates the fact that the comma used in base B has to be considered as an additional, genuine connective, and not as a simple conjunction. In this work we define and investigate a propositional framework with such a "comma connective". We give it a semantics and show how it generalizes several approaches for reasoning from inconsistent beliefs.