Deciding the inductive validity of ∀∃* queries

  • Authors:
  • Matthias Horbach;Christoph Weidenbach

  • Affiliations:
  • Max Planck Institute for Informatics, Saarbrücken, Germany;Max Planck Institute for Informatics, Saarbrücken, Germany

  • Venue:
  • CSL'09/EACSL'09 Proceedings of the 23rd CSL international conference and 18th EACSL Annual conference on Computer science logic
  • Year:
  • 2009

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Abstract

We present a new saturation-based decidability result for inductive validity. Let Σ be a finite signature in which all function symbols are at most unary and let N be a satisfiable Horn clause set without equality in which all positive literals are linear. If N ∪ {A1, ... , An →} belongs to a class that can be finitely saturated by ordered resolution modulo variants, then it is decidable whether a sentence of the form ¬x.∃y→.A1 ∧ ... ∧ An is valid in the minimal model of N.