'Context free language' presentation slideshows

CFL Hierarchy CFL Decision Problems

MA/CSSE 474 Theory of Computation. CFL Hierarchy CFL Decision Problems. Your Questions?. I have included some slides online that we will not have time to do in class, but may be helpful to you anyway. Previous class days' material Reading Assignments. HW 12 or 13 problems Anything else.

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Pumping Lemma for Context-free Languages

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Pushdown Automata

Pushdown Automata. Chapter 12. Recognizing Context-Free Languages. Two notions of recognition: (1) Say yes or no, just like with FSMs (2) Say yes or no, AND if yes, describe the structure. a + b * c. Just Recognizing.

849 views • 63 slides

Nested Words and Trees

Nested Words and Trees. Rajeev Alur University of Pennsylvania Joint work with S.Chaudhuri & P.Madhusudan. Games Workshop, Cambridge, UK, July 2006. Software Model Checking. Research challenges Search algorithms Abstraction Static analysis Refinement Expressive specs. Program.

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Scanner

Scanner. Grammar. Language. Recursive Definition. Mathematical Expression. Structure of Expressions. Formal Language. Backus Naur Form (BNF). 1960 by J. Backus and P. Naur. EBNF (Extended BNF). BNF ? EBNF. BNF. EBNF. Formalism (Formal notation). N. Chomsky ?????????.

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Pushdown Automata

Pushdown Automata. Chapter 12. Recognizing Context-Free Languages. Two notions of recognition: (1) Say yes or no, just like with FSMs (2) Say yes or no, AND if yes, describe the structure. a + b * c. Just Recognizing.

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CSCI 2670 Introduction to Theory of Computing

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Properties of Context-Free languages

Properties of Context-Free languages. Union. Context-free languages are closed under:. Union. is context free. is context free. is context-free. Example. Language. Grammar. Union. In general:. For context-free languages with context-free grammars and start variables.

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CSCI 2670 Introduction to Theory of Computing

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Pushdown Automata

Pushdown Automata. Chapter 12. Recognizing Context-Free Languages. We need a device similar to an FSM except that it needs more power. The insight: Precisely what it needs is a stack, which gives it an unlimited amount of memory with a restricted structure.

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Lecture 16 Oct 18

Lecture 16 Oct 18. Context-Free Languages (CFL) - basic definitions Examples. Context-Free Languages (Ch. 2). Context-free languages allow us to describe non-regular languages like { 0 n 1 n | n ? 0}.

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Lecture 16 Oct 18

Lecture 16 Oct 18. Context-Free Languages (CFL) - basic definitions Examples. Context-Free Languages (Ch. 2). Context-free languages allow us to describe non-regular languages like { 0 n 1 n | n ? 0}.

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Computability

Computability. Joke. Context-free grammars Parsing. Chomsky Homework: Design grammar for [simple] computer language. Proof by induction. Requires the subject domain to be classified by natural numbers: 0 or 1 or some starting point, and then all numbers following

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CSCI 3130: Formal languages and automata theory

Fall 2011. The Chinese University of Hong Kong. CSCI 3130: Formal languages and automata theory. Limitations of pushdown automata. Andrej Bogdanov http://www.cse.cuhk.edu.hk/~andrejb/csc3130. Non context-free languages. ?. L 1 = { a n b n : n ? 0}

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Introduction and Syntax

Introduction and Syntax. Course objectives. Discuss features of programming languages. Discuss how the features are implemented in a simple computer architecture (what is happening under the hood). Introduce a few specific programming languages: C++, Java, Ada, Scheme, ML. Desiderata.

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MPS 2016

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13. LANGUAGE AND COMPLEXITY

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Chapter 5 Context-Free Languages

Chapter 5 Context-Free Languages. Regular language are effective in describing certain simple patterns. But it is not enough to describe programming languages. Context-Free languages cover more complicated languages. Context free. Linear grammars. It is not a linear grammar. S. a. A.

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CS 3240: Languages and Computation

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Pushdown Automata and Context-Free Grammars

Pushdown Automata and Context-Free Grammars. Reading: 7.2 & 7.3. CFG(L) = PDA(L). Any context-free language has a pushdown automata that accepts the language. Any context-free language can be written in Greibach Normal Form. (All productions of the form

264 views • 6 slides