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Termination proofs and the length of derivations

  • Dieter Hofbauer
  • Clemens Lautemann
Regular Papers
Part of the Lecture Notes in Computer Science book series (LNCS, volume 355)

Abstract

The derivation height of a term t, relative to a set R of rewrite rules, dh R (t), is the length of a longest derivation from t. We investigate in which way certain termination proof methods impose bounds on dh R . In particular we show that, if termination of R can be proved by polynomial interpretation then dh R is bounded from above by a doubly exponential function, whereas termination proofs by Knuth-Bendix ordering are possible even for systems where dh R cannot be bounded by any primitive recursive functions. For both methods, conditions are given which guarantee a singly exponential upper bound on dh R . Moreover, all upper bounds are tight.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • Dieter Hofbauer
    • 1
  • Clemens Lautemann
    • 2
  1. 1.Technische Universität BerlinGermany
  2. 2.Universität BremenGermany

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