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Formalization of simplification for context-free grammars

Context-free grammar simplification is a subject of high importance in computer language processing technology as well as in formal language theory. This paper presents a formalization, using the Coq proof assistant, of the fact that general context-free grammars generate languages that can be also generated by simpler and equivalent context-free grammars. Namely, useless symbol elimination, inaccessible symbol elimination, unit rules elimination and empty rules elimination operations were described and proven correct with respect to the preservation of the language generated by the original grammar.

preprint2015arXivOpen access
Marcus V. M. RamosRuy J. G. B. de Queiroz
Formal Languages and Automata Theory
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Marcus V. M. RamosRuy J. G. B. de Queiroz

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