'Stack symbol' diaporamas de présentation

Chapter 7 Pushdown Automata

Chapter 7 Pushdown Automata. Regular Languages (Review). Regular languages are described by regular expressions. generated via regular grammars. accepted by deterministic finite automata DFA nondeterministic finite automata NFA

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Chapter 7 Pushdown Automata

Chapter 7 Pushdown Automata. Regular Languages (Review). Regular languages are described by regular expressions. generated via regular grammars. accepted by deterministic finite automata DFA nondeterministic finite automata NFA

988 views • 59 slides

Introduction to Computability Theory

Introduction to Computability Theory. Lecture6: PushDown Automata Prof. Amos Israeli. Introduction and Motivation. In this lecture we introduce Pushdown Automata , a computational model equivalent to context free languages.

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Pushdown automata (PDAs).

Pushdown automata (PDAs). The automata that accept context-free languages are called pushdown automata (PDAs). They are essentially just NFAs equipped with a stack-based memory. Compared with NFAs, they have two extra components.

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Chapter 3

Chapter 3. Pushdown Automata and Context-Free Languages. NPDAs. A NPDA (Nondeterministic PushDown Automata) is a 7-tuple M = (Q, S , G , d ,s, ? , F) where Q is a finite set (the states) S is a finite set (the input alphabet) G is a finite set (the stack alphabet)

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Introduction to Computability Theory

Introduction to Computability Theory. Lecture7: PushDown Automata (Part 1) Prof. Amos Israeli. Introduction and Motivation. In this lecture we introduce Pushdown Automata , a computational model equivalent to context free languages.

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Chapter 3

Chapter 3. Pushdown Automata and Context-Free Languages. NPDAs. A NPDA (Nondeterministic PushDown Automata) is a 7-tuple M = (Q, S , G , d ,s, ? , F) where Q is a finite set (the states) S is a finite set (the input alphabet) G is a finite set (the stack alphabet)

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Chapter 3

Chapter 3. Pushdown Automata and Context-Free Languages. NPDAs. A NPDA (Nondeterministic PushDown Automata) is a 7-tuple M = (Q, S , G , d ,s, ? , F) where Q is a finite set (the states) S is a finite set (the input alphabet) G is a finite set (the stack alphabet)

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Chapter 3

Chapter 3. Pushdown Automata and Context-Free Languages. NPDAs. A NPDA (Nondeterministic PushDown Automata) is a 7-tuple M = (Q, S , G , d ,s, ? , F) where Q is a finite set (the states) S is a finite set (the input alphabet) G is a finite set (the stack alphabet)

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Chapter 3

Chapter 3. Pushdown Automata and Context-Free Languages. NPDAs. A NPDA (Nondeterministic PushDown Automata) is a 7-tuple M = (Q, S , G , d ,s, ? , F) where Q is a finite set (the states) S is a finite set (the input alphabet) G is a finite set (the stack alphabet)

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Pushdown Automata (PDA)

Pushdown Automata (PDA). CSE-501 Formal Language & Automata Theory Aug-Dec,2010. ALAK ROY. Assistant Professor Dept. of CSE NIT Agartala. Pushdown Automata (PDA). Informally: Think of an ? -NFA with the additional power that it can manipulate a stack.

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Chapter 5 Pushdown Automata

Chapter 5 Pushdown Automata. 5.1 Pushdown Automata. In this section, we shall introduce pushdown automata as machines to accept context-free languages. For a context-free grammar G, there is an equivalent pushdown automaton M to recognize the language generated by the grammar G.

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PDAs => CFGs

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Pushdown Automata

[Section 7.1]. Pushdown Automata. like NFA- ? but also has a stack transition takes the current state, the current input symbol, and the top-of-the-stack symbol (which is removed from the stack) and returns a state and a string to place in the stack

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PDA to CFG

PDA to CFG. Toqa Manasrah. Example. Convert the PDA P={{ p,q }, {0,1}, {X,Z}, q, Z, { }, ? } to a CFG if ? is given by : 1. ? (q,1,Z)={( q,XZ )} 2. ? (q,1,X)={( q,XX )} 3 . ? (q,0,X)={( q,X )} 4. ? (p,0,Z)={( q,Z )} 5. ? (q, ? ,X )={(q, ? )} 6. ? (p,1,X )={(p, ? )}.

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Pushdown Automata

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Section 12.2 Pushdown Automata

i. j. j. j. i. i. k. k. Section 12.2 Pushdown Automata A pushdown automaton (PDA) is a finite automaton with a stack that has stack operations pop, push, and nop. PDAs always start with one designated symbol on the stack. A state

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Rumination on the Formal Definition of DPDA

q. r. ( ? , A/CA). (a, A/BA). p. p. Rumination on the Formal Definition of DPDA. In the definition of DPDA, there are some parts that do not agree with our intuition. Let M = (Q, ? , ? , ? , q 0 , Z 0 , F ) be a DPDA. According to the definition, M has the following restrictions.

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