Acta Informatica

, Volume 3, Issue 3, pp 265–283 | Cite as

Nonterminals versus homomorphisms in defining languages for some classes of rewriting systems

  • A. Ehrenfeucht
  • G. Rozenberg


Given a rewriting system G (its alphabet, the set of productions and the axiom) one can define the language of G by
  1. (i)

    taking out of all strings generated by G only those which are over a distinguished subalphabet of G, or

  2. (ii)

    translating the set of all strings generated by G by a fixed homomorphism.


The “trade-offs” between these two mechanisms for defining languages are discussed for both “parallel” rewriting systems from the developmental systems hierarchy and “sequential” rewriting systems from the Chomsky hierarchy.


Information System Operating System Data Structure Communication Network Information Theory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • A. Ehrenfeucht
    • 1
  • G. Rozenberg
    • 2
    • 3
  1. 1.Department of Computer ScienceUniversity of ColoradoBoulderUSA
  2. 2.Institute of Mathematics University of UtrechtUtrecht-UithofThe Netherlands
  3. 3.Department of MathematicsAntwerp University, UIAWilrijkBelgium

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