A survey of normal form covers for context-free grammars

Anton Nijholt

doi:10.1007/BF00264257

A survey of normal form covers for context-free grammars

Anton Nijholt

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Abstract

An overview is given of cover results for normal forms of context-free grammars. The emphasis in this paper is on the possibility of constructing ɛ-free grammars, non-left-recursive grammars and grammars in Greibach normal form. Among others it is proved that any ɛ-free context-free grammar can be right covered with a context-free grammar in Greibach normal form. All the cover results concerning the ɛ-free grammars, the non-left-recursive grammars and the grammars in Greibach normal form are listed, with respect to several types of covers, in a cover-table.

Original language	English
Pages (from-to)	271-294
Number of pages	24
Journal	Acta informatica
Volume	14
Issue number	3
DOIs	https://doi.org/10.1007/BF00264257
Publication status	Published - Sep 1980

Keywords

EWI-9218
IR-66927
HMI-SLT: Speech and Language Technology

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10.1007/BF00264257

actaInf1980
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abstract = "An overview is given of cover results for normal forms of context-free grammars. The emphasis in this paper is on the possibility of constructing ɛ-free grammars, non-left-recursive grammars and grammars in Greibach normal form. Among others it is proved that any ɛ-free context-free grammar can be right covered with a context-free grammar in Greibach normal form. All the cover results concerning the ɛ-free grammars, the non-left-recursive grammars and the grammars in Greibach normal form are listed, with respect to several types of covers, in a cover-table.",

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AB - An overview is given of cover results for normal forms of context-free grammars. The emphasis in this paper is on the possibility of constructing ɛ-free grammars, non-left-recursive grammars and grammars in Greibach normal form. Among others it is proved that any ɛ-free context-free grammar can be right covered with a context-free grammar in Greibach normal form. All the cover results concerning the ɛ-free grammars, the non-left-recursive grammars and the grammars in Greibach normal form are listed, with respect to several types of covers, in a cover-table.

KW - EWI-9218

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KW - HMI-SLT: Speech and Language Technology

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JF - Acta informatica

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ER -

A survey of normal form covers for context-free grammars

Abstract

Keywords

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