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Pushdown Automata

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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851 views • 63 slides
Pushdown Automata

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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777 views • 52 slides
Pushdown Automata

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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928 views • 52 slides
Pushdown Automata Part I: PDAs

Pushdown Automata Part I: PDAs

Pushdown Automata Part I: PDAs. 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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390 views • 38 slides
PDA examples More About Nondeterminism

PDA examples More About Nondeterminism

MA/CSSE 474 Theory of Computation. PDA examples More About Nondeterminism. Your Questions?. Previous class days' material Reading Assignments. HW11 or 12 problems Anything else. Recap: Definition of a Pushdown Automaton. M = ( K , ? , ? , ? , s , A ), where:

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286 views • 27 slides
Modeling algorithms

Modeling algorithms

Modeling algorithms. Neither the class of DFAs nor the class of PDAs are sufficiently general to model the informal notion of an algorithm. For example, no DFA or PDA can check membership in {0 n 1 n 2 n | n > 0}. There are several formalisms that attempt to model this informal notion.

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377 views • 26 slides
Proof of the Pumping Theorem for Regular Languages

Proof of the Pumping Theorem for Regular Languages

Proof of the Pumping Theorem for Regular Languages. Richard Beigel CIS Temple University. The Pumping Theorem for Regular Languages. If L is regular then ? N ? z such that z ? L and | z | ? N ? u , v , w such that z = uvw , | uv | ? N , and | v | > 0

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201 views • 13 slides

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