Book chapter

MEDUNA Alexander and ZEMEK Petr. One-Sided Random Context Grammars: A Survey. Computing with New Resources. Berlin: Springer Verlag, 2014, pp. 338-351. ISBN 978-3-319-13349-2. Available from:
Publication language:english
Original title:One-Sided Random Context Grammars: A Survey
Title (cs):Jednostranné gramatiky s nahodilým kontextem: Přehled
Book:Computing with New Resources
Place:Berlin, DE
Publisher:Springer Verlag
formal language theory, regulated rewriting, random context grammars, one-sided random context grammars, generative power, normal forms, reduction, leftmost derivations, generalized versions, survey
Recall that the notion of a one-sided random context grammar is based upon a finite set of context-free rules, each of which may be extended by finitely many permitting and forbidding nonterminal symbols. The set of all these rules is divided into two sets - the set of left random context rules and the set of right random context rules. When applying a left random context rule, the grammar checks the existence and absence of its permitting and forbidding symbols, respectively, in the prefix to the left of the rewritten nonterminal. Analogically, when applying a right random context rule, it checks the existence and absence of its permitting and forbidding symbols, respectively, only in the suffix to the right of the rewritten nonterminal.

This paper gives a survey of the established results concerning one-sided random context grammars. These results concern their generative power, normal forms, size reduction, and conceptual modifications, which represent both restricted and generalized versions of their standard concepts. Perhaps most importantly and surprisingly, the paper points out that propagating versions of one-sided random context grammars characterize the family of context-sensitive languages, and with erasing rules, they characterize the family of recursively enumerable languages; as a result, they are stronger than ordinary random context grammars. Many open problem areas are suggested.
   author = {Alexander Meduna and Petr Zemek},
   title = {One-Sided Random Context Grammars: A Survey},
   pages = {338--351},
   booktitle = {Computing with New Resources},
   year = {2014},
   location = {Berlin, DE},
   publisher = {Springer Verlag},
   ISBN = {978-3-319-13349-2},
   language = {english},
   url = {}

Your IPv4 address:
Switch to IPv6 connection

DNSSEC [dnssec]