'Useless symbols' presentation slideshows

UNIT - II

UNIT - II. Grammar Formalism: Chomsky hierarchy of languages, Context free grammar, derivation trees, and sentential forms. Right most and leftmost derivation of strings, Ambiguity in context free grammars. Minimization of Context Free Grammars. Chomsky normal form, Greibach normal form.

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Properties of Context-free Languages

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Chapter 6 Properties Of Context Free Languages Prepared By: Swetha G , Pramela.

Chapter 6 Properties Of Context Free Languages Prepared By: Swetha G , Pramela. Department: ISE & CSE Date : 07 / 10 / 2014. Topics Covered: Normal forms for CFGs The pumping lemma for CFGs Closure properties of CFGs Examples. Simplification of CFG

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Chomsky & Greibach Normal Forms

Chomsky & Greibach Normal Forms. By, Mr.R.Karunamoorthi , AP / CSE. Presentation Outline. Introduction Chomsky normal form Preliminary simplifications Final steps Greibach Normal Form Algorithm (Example) Summary. Introduction. Grammar: G = (V, T, P, S). T = { a, b }. Terminals.

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Properties of Context-Free Languages

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Normal Forms

Normal Forms. Chomsky Normal Form Griebach Normal Form. Language preserving transformations Improve parsing efficiency Prove properties about languages and derivations. Shorter derivations. Elimination of l- rules. Reduces the length of the derivation.

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7 . Properties of Context-Free Languages

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Lecture # 11

Lecture # 11. Grammar Problems . Left Recursion. A grammar is left recursive if for a non-terminal A, there is a derivation A? + A? There are three types of left recursion: direct (A ? A x) indirect (A ? B C, B ? A ) hidden (A ? B A, B ? ?). How to eliminate Left recursion?.

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About Grammars

About Grammars. CS 130 Theory of Computation HMU Textbook: Sec 7.1, 6.3, 5.4. About grammars. Simplifying grammars Normal forms for grammars Grammar Ambiguity. Grammar Productions. Formal definition of a grammar provides much leeway

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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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CONVERTING TO CHOMSKY NORMAL FORM

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