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Myhill–Nerode theorem
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{{short description|Necessary and sufficient condition for a formal language to be regular}} In the theory of [[formal language]]s, the '''Myhill–Nerode theorem''' provides a [[necessary and sufficient conditions|necessary and sufficient condition]] for a language to be [[regular language|regular]]. The theorem is named for [[John Myhill]] and [[Anil Nerode]], who proved it at the [[University of Chicago]] in 1957 {{harv|Nerode|Sauer|1957|p=ii}}.
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