On purely morphic characterizations of context-free languages

Takashi Yokomori

doi:10.1016/0304-3975(87)90038-7

On purely morphic characterizations of context-free languages

Takashi Yokomori^*

^*この研究の対応する著者

研究成果: Article › 査読

3 被引用数 (Scopus)

抄録

In this paper we show the following: For any λ-free context-free language L there effectively exist a weak coding g, a homomorphism h such that L=gh^-1 ({divides}cD₂), where D₂ is the Dyck set over a two-letter alphabet. As an immediate corollary it follows that for any λ-free context-free language L there exist a weak coding g and a mapping F such that L=gF^-1({divides}c).

本文言語	English
ページ（範囲）	301-308
ページ数	8
ジャーナル	Theoretical Computer Science
巻	51
号	3
DOI	https://doi.org/10.1016/0304-3975(87)90038-7
出版ステータス	Published - 1987
外部発表	はい

ASJC Scopus subject areas

理論的コンピュータサイエンス
コンピュータサイエンス（全般）

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10.1016/0304-3975(87)90038-7

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AB - In this paper we show the following: For any λ-free context-free language L there effectively exist a weak coding g, a homomorphism h such that L=gh-1 ({divides}cD2), where D2 is the Dyck set over a two-letter alphabet. As an immediate corollary it follows that for any λ-free context-free language L there exist a weak coding g and a mapping F such that L=gF-1({divides}c).

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On purely morphic characterizations of context-free languages

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