The undecidability of the first-order theories of one step rewriting in linear canonical systems

  • Authors:
  • Sergei Vorobyov

  • Affiliations:
  • Uppsala Univ., Uppsala, Sweden

  • Venue:
  • Information and Computation
  • Year:
  • 2002

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Abstract

By reduction form the halting problem for Minsky's two-register machines we prove that there is no algorithm capable of deciding the XXXXX-theory of one step rewriting of an arbitrary finite linear confluent finitely terminating term rewriting system (weak undecidability). We also present a fixed system with undecidable XXX_theory of one step rewriting (strong undecidability). This improves over all previously known results of the same kind.