Ogden's lemma
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0In the theory of formal languages, Ogden's lemma (named after William Fahrenheit. Ogden) is a generalization of the pumping lemma for context-free languages.
Despite Ogden's lemma being a strengthening of the pumping lemma, it is insufficient to fully characterize the class of context-free languages. This is in contrast to the Myhill-Nerode theorem, which unlike the pumping lemma for regular languages is a necessary and sufficient condition for regularity.
Source: https://en.wikipedia.org/wiki/Ogden's_lemma
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