The Church-Rosser languages are the deterministic variants of the growing context-sensitive languages

  • Authors:
  • Gundula Niemann;Friedrich Otto

  • Affiliations:
  • Franz-Schubert-Str. 5/1, D-69168 Wiesloch, Germany;Fachbereich Mathematik/Informatik, Universität Kassel, D-34109 Kassel, Germany

  • Venue:
  • Information and Computation
  • Year:
  • 2005

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Abstract

The growing context-sensitive languages have been classified through the shrinking two-pushdown automaton, the deterministic version of which characterizes the class of generalized Church-Rosser languages [Inform. Comput. 141 (1998) 1]. Exploiting this characterization we prove that the latter class coincides with the class of Church-Rosser languages that was introduced by McNaughton et al. [J. ACM 35 (1988) 324]. Based on this result several open problems of McNaughton et al. are solved. In addition, we show that shrinking two-pushdown automata and length-reducing two-pushdown automata are equivalent, both in the non-deterministic and the deterministic case, thus obtaining still another characterization of the growing context-sensitive languages and the Church-Rosser languages, respectively.