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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Journal of the ACMarrow_drop_down
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Journal of the ACM
Article . 1963 . Peer-reviewed
License: https://www.acm.org/publications/policies/copyright_policy#Background
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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
zbMATH Open
Article . 1963
Data sources: zbMATH Open
DBLP
Article . 2018
Data sources: DBLP
https://dx.doi.org/10.1145/321...
Article
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Quotients of Context-Free Languages

Quotient of context-free languages
descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 1963 English Publisher:Association for Computing Machinery (ACM)Journal:Journal of the ACM, volume 10, pages 487-492 (issn: 0004-5411, eissn: 1557-735X, Copyright policy )
Authors: Seymour Ginsburg; Edwin H. Spanier;

doi: 10.1145/321186.321191

Quotients of Context-Free Languages

Abstract

Abstract : The following results on the quotient of context free languages CFL are shown: (1) It is recursively unsolvable to determine for arbitrary CFL whether the quotient of one by another is a CFL. (2) If either set is regular and the other is a CFL, then the quotient is a CFL. (Author)

Related Organizations
Keywords

Algebraic theory of languages and automata

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    popularity
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    		 Top 10%
    influence
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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Powered by OpenAIRE graph
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
28
Top 10%
Top 1%
Top 10%
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