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Necessary properties of formal langagues in certain classes that rely on closure against repetition of certain subwords. Make sure your question isn't covered by applying the techniques in https://cs.stackexchange.com/q/1031/755.

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Can there be a context-sensitive pumping lemma?

Here is some evidence that there is no pumping lemma for the context-sensitive languages. Of course, an answer hinges on the question what constitutes a pumping lemma. The weakest reasonable definit …
Georg Zetzsche's user avatar