The Equivalence of Tree Adjoining Grammars and Monadic Linear Context-free Tree Grammars

  • Authors:
  • Stephan Kepser;Jim Rogers

  • Affiliations:
  • Collaborative Research Center 441, University of Tübingen, Tübingen, Germany;Computer Science Department, Earlham College, Richmond, USA

  • Venue:
  • Journal of Logic, Language and Information
  • Year:
  • 2011

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Abstract

The equivalence of leaf languages of tree adjoining grammars and monadic linear context-free grammars was shown about a decade ago. This paper presents a proof of the strong equivalence of these grammar formalisms. Non-strict tree adjoining grammars and monadic linear context-free grammars define the same class of tree languages. We also present a logical characterisation of this tree language class showing that a tree language is a member of this class iff it is the two-dimensional yield of an MSO-definable three-dimensional tree language.