Contextual Rewriting In Automated Reasoning

  • Authors:
  • Hantao Zhang

  • Affiliations:
  • (Partially supported by the National Science Foundation under Giants CCR-9202838 and CCR-9357851) Department of Computer Science, The University of Iowa, Iowa City, IA 52242, hzhang@cs.uiowa.edu

  • Venue:
  • Fundamenta Informaticae
  • Year:
  • 1995

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Abstract

Contextual rewriting as a generalization of conditional rewriting has been found in different forms in the papers whose major subject is not contextual rewriting. Here, we put the scattered information together and give it a systematic study. Among various properties of contextual rewriting, we show that contextual rewriting is a powerful simplification rule for the first-order theorem proving with equality and preserves the refutational completeness of many reasoning systems. We compare definitions of contextual rewriting by Boyer-Moore, Rémy, Zhang-Rémy, Ganzinger, Zhang-Kapur, and Bouhoula-Rusinowitch in regard to its efficiency and power. We provide a detailed procedure for simplifying clauses using contextual rewriting and a solution on how to handle variables which appear only in the condition of a conditional rewrite rule.