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Pumping lemma
Index of articles associated with the same name From Wikipedia, the free encyclopedia
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In the theory of formal languages, the pumping lemma may refer to:
- Pumping lemma for regular languages, the fact that all sufficiently long strings in such a language have a substring that can be repeated arbitrarily many times, usually used to prove that certain languages are not regular
- Pumping lemma for context-free languages, the fact that all sufficiently long strings in such a language have a pair of substrings that can be repeated arbitrarily many times, usually used to prove that certain languages are not context-free
- Pumping lemma for indexed languages
- Pumping lemma for regular tree languages
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See also
- Ogden's lemma, a stronger version of the pumping lemma for context-free languages
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