The Existential Fragment of the One-Step Parallel Rewriting Theory

  • Authors:
  • Aleksy Schubert

  • Affiliations:
  • Institute of Informatics, Warsaw University, Warsaw, Poland 02-097 and SoS Group NIII Faculty of Science, University of Nijmegen, The Netherlands

  • Venue:
  • RTA '09 Proceedings of the 20th International Conference on Rewriting Techniques and Applications
  • Year:
  • 2009

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Abstract

It is known that the first-order theory with a single predicate *** that denotes a one-step rewriting reduction on terms is undecidable already for formulae with *** *** prefix. Several decidability results exist for the fragment of the theory in which the formulae start with the *** prefix only. This paper considers a similar fragment for a predicate *** p which denotes the parallel one-step rewriting reduction. We show that the first-order theory of *** p is undecidable already for formulae with *** 7 prefix and left-linear rewrite systems.