Tree Valence Controlled Grammars

  • Salbiah Ashaari
  • Abdurahim Okhunov


Beyond a shadow of a doubt, the studying of context-free grammars with restricted derivation
trees known as tree controlled grammars have achieved plentiful remarkable results within formal
language theory as demonstrated in a number of publications on this subject for the past forty five years.
In principle, these grammars generate their languages as an ordinary context-free grammar except their
derivation trees need to be satisfied by certain prescribed conditions. Our paper is a continuing of studying
of this kind of grammars, where we introduce a new variant of tree controlled grammar called a tree
valence controlled grammar, which replaces regular sets with valences where every main production with
certain integer value will be derived into sub-productions with the value of combination of zero and one or
zero and minus represented in matrices form with the permutations of each matrix row yield a zero value
(at every level of tree derivation, the summation of valence value is zero). We also investigate the
generative capacity and structural properties of these grammars.

How to Cite
Ashaari, S., TURAEV, S., & Okhunov, A. (2017). Tree Valence Controlled Grammars. International Journal on Perceptive and Cognitive Computing, 3(1). Retrieved from

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