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HomeMIT 18.404J Theory of Computation, Fall 2020Lecture 3: Regular Pumping Lemma, Finite Automata → Regular Expressions, CFGs

Lecture 3: Regular Pumping Lemma, Finite Automata → Regular Expressions, CFGs

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Lecture 4: Pushdown Automata, CFG ↔ PDA

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Description: Quickly reviewed last lecture. Showed conversion of DFAs to regular expressions. Gave a method for proving languages not regular by using the pumping lemma and closure properties. Introduced context free grammars (CFGs).

Instructor: Prof. Michael Sipser