'Terminal string' diaporamas de présentation

Context Free Grammars

Context Free Grammars. The Total Language Tree. It is possible to depict the generation of all the words in the language of a CFG simultaneously in one big (possibly infinite) tree. Definition:

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The Pumping Lemma for Context Free Grammars

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The Pumping Lemma for Context Free Grammars

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Chomsky Normal Form

Chomsky Normal Form. Chomsky Normal Form (CNF). Definition If a CFG has only productions of the form Non-Terminal ? string of exactly two non-terminals OR Non-Terminal ? one terminal It is said to be in Chomsky Normal Form. Chomsky Normal Form (CNF).

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Chomsky Normal Form

Chomsky Normal Form. Chomsky Normal Form (CNF). Definition If a CFG has only productions of the form Non-Terminal ? string of exactly two non-terminals OR Non-Terminal ? one terminal It is said to be in Chomsky Normal Form. Theorem 25.

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Chapter 4

Chapter 4. Normal Forms for CFGs. 4.5 Chomsky Normal Form. Defn 4.4.1 A CFG G = ( V , ?, P , S ) is in chomsky normal form if each rule in G has one of the following forms: i) A ? BC ii) A ? a iii) S ? ? where A , B , C ? V and B , C ? V - { S } and a ? ?

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About Grammars

About Grammars. Hopcroft, Motawi, Ullman, Chap 7.1, 6.3, 5.4. About grammars. Normal forms for grammars Equivalence between CFGs and PDAs Grammar Ambiguity. Grammar Productions. Formal definition of a grammar provides much leeway

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