Completeness and decidability results for first-order clauses with indices

  • Authors:
  • Abdelkader Kersani;Nicolas Peltier

  • Affiliations:
  • University of Grenoble (LIG, CNRS), France;University of Grenoble (LIG, CNRS), France

  • Venue:
  • CADE'13 Proceedings of the 24th international conference on Automated Deduction
  • Year:
  • 2013

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Abstract

We define a proof procedure that allows for a limited form of inductive reasoning. The first argument of a function symbol is allowed to belong to an inductive type. We will call such an argument an index. We enhance the standard superposition calculus with a loop detection rule, in order to encode a particular form of mathematical induction. The satisfiability problem is not semi-decidable, but some classes of clause sets are identified for which the proposed procedure is complete and/or terminating.