context-free languages

Ramos MVM, Almeida JB, Moreira N, de Queiroz RJGB.  2016.  Formalization of the Pumping Lemma for Context-Free Languages. Journal of Formalized Reasoning. 9(2):53-68. Abstract16jfr.pdfWebsite

Context-free languages are highly important in computer language processing technology as well as in formal language theory. The Pumping Lemma is a property that is valid for all context-free languages, and is used to show the existence of non context-free languages. This paper presents a formalization, using the Coq proof assistant, of the Pumping Lemma for context-free languages.