On Relax-ability of Word-Order by D-grammars

  • Martin Plátek
  • Tomáš Holan
  • Vladislav Kuboň
Conference paper
Part of the Discrete Mathematics and Theoretical Computer Science book series (DISCMATH)


This paper studies the relaxation of word-order, using dependency grammars (DG’s). We study ‘relax-ability of languages (and DG’s)’ based on the notion of DR-(non)projectivity. We obtain two infinite scales of classes of languages using different degrees of relaxation. The one scale contains the class of context-free languages as its first (minimal) element, the other one starts by the class of regular languages.


Word Order Regular Language Vertical Edge Previous Claim Context Grammar 
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Copyright information

© Springer-Verlag London Limited 2001

Authors and Affiliations

  • Martin Plátek
    • 1
  • Tomáš Holan
    • 1
  • Vladislav Kuboň
    • 1
  1. 1.Faculty of Mathematics and PhysicsCharles UniversityPragueCzech Republic

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