'Sofya raskhodnikova' presentation slideshows

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Intro to Theory of Computation

Intro to Theory of Computation

L ECTURE 8 Last time: Pumping lemma for CFLs Proving that a language is not CF Today: Equivalence of CFGs and PDAs Turing Machines. Intro to Theory of Computation. CS 332. Sofya Raskhodnikova. Read on your own. Ambiguous CFGs. Chomsky normal form for CFGs

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312 views • 31 slides
Intro to Theory of Computation

Intro to Theory of Computation

L ECTURE 2 Theory of Computation Finite Automata Operations on languages Nondeterminism. Intro to Theory of Computation. CS 464. Sofya Raskhodnikova. Homework 0 due Homework 1 handed out. JFLAP http://www.cs.duke.edu/csed/jflap/. aaa. a aa. a a a. aa a. q 1. 1. 0. 0,1. 1. M.

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530 views • 26 slides
Intro to Theory of Computation

Intro to Theory of Computation

L ECTURE 6 Last time: Pumping lemma Proving a language is not regular Today: Pushdown automata (PDAs) Context-free grammars (CFGs). Intro to Theory of Computation. CS 332. Sofya Raskhodnikova. On Friday:. Homework 2 due Homework 3 out. CS332 so far. MODEL OF A PROBLEM: LANGUAGE.

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266 views • 26 slides
Intro to Theory of Computation

Intro to Theory of Computation

L ECTURE 8 Theory of Computation Converting a PDA to a CFG Pumping Lemma for CFLs. Intro to Theory of Computation. CS 464. Sofya Raskhodnikova. A language is generated by a CFG It is recognized by a PDA. ?. Converting a PDA to a CFG. Given PDA P = (Q, ? , ? , ?, q, F).

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318 views • 21 slides
Intro to Theory of Computation

Intro to Theory of Computation

Intro to Theory of Computation. L ECTURE 4 Theory of Computation Equivalence of NFAs, DFAs and regular expressions. CS 464. Sofya Raskhodnikova. The class of regular languages is closed under. Regular operations. Union: A ? B = { w | w ? A or w ? B }.

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286 views • 18 slides
Intro to Theory of Computation

Intro to Theory of Computation

L ECTURE 10 Theory of Computation Review Constructing PDAs Turing Machines. Intro to Theory of Computation. CS 464. Sofya Raskhodnikova. Context-free or not?. L? = { xy | x,y ? {0,1}* and x=y}. NOT. YES. L? = {xy | x,y ? {0,1}*, |x|=|y| and x ? y}.

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321 views • 15 slides
Intro to Theory of Computation

Intro to Theory of Computation

L ECTURE 12 Theory of Computation Turing Machines Turing Machine Variants. Intro to Theory of Computation. CS 464. Sofya Raskhodnikova. TM versus PDA. TM can both write to and read from the tape. The head can move left and right. The input does not have to be read entirely.

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225 views • 13 slides
Intro to Theory of Computation

Intro to Theory of Computation

L ECTURE 9 Theory of Computation Review Pumping Lemma for CFLs Correctness of CFGs. Intro to Theory of Computation. CS 464. Sofya Raskhodnikova. Pumping lemma for CFLs. Let L be a context-free language. Then there exists P such that For every w ? L with |w| ? P.

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190 views • 8 slides

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