In this paper we propose a Chomsky-Schützenberger type characterization ofpoly-slender context-free languages, as the homomorphical image of an intersection of a Dyck language and a ´¾ • ½ µ -poly-slender regular language. A stronger result is provided, namely the homomorphism and the Dyck language
A decision method for Parikh slenderness of context-free languages
✍ Scribed by Juha Honkala
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 218 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0166-218X
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✦ Synopsis
In a recent paper we introduced Parikh slender languages as a generalization of slender languages defined and studied by AndraSiu, Dassow, Pgun and Salomaa. Results concerning Pa&h slender languages can be applied in ambiguity proofs of context-free languages. In this paper an algorithm is presented for deciding whether or not a given context-free language is Parikh slender.
📜 SIMILAR VOLUMES
In this paper we first compare Parikh's condition to various pumping conditions ~ Bar-Hillel's pumping lemma, Ogden's condition and Bader-Moura's condition; secondly, to interchange condition; and finally, to Sokolowski's and Grant"s conditions. In order to carry out these comparisons we present som
A practical method is presented for the automatic generation of a non-recursive context-free grammar (cfg) from a set of strings that the cfg is required to be capable of producing. The method is efficient in computing time by comparison with enumerative methods.