The pumping lemma for context-free languages is a property shared by all context-free languages and can be used to prove that a language is not context-free. It does not guarantee that a language is context-free, however, as other conditions must also be met. Ogden's lemma and the Interchange lemma are examples of these conditions.
Carnegie Mellon University
Spring 2015
A foundational course that introduces formal languages, automata, computability, and complexity theories, including finite automata, Turing machines, and P/NP classes.
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