'Recursively enumerable' presentation slideshows

Turing Machines (TM)

Turing Machines (TM). Generalize the class of CFLs: Note that there are non-recursively enumerable languages. Recursively Enumerable Languages. Recursive Languages. Context-Free Languages. Regular Languages. Recursively Enumerable Languages. Recursive Languages.

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Complexity and Computability Theory I

Complexity and Computability Theory I. Lecture #10 Instructor: Rina Zviel-Girshin Lea Epstein. Overview. Regular grammars Examples Conversion of an NFA to a Regular Grammar Conversion of a Regular Grammar to an NFA Chomsky grammar hierarchy Operations over grammars

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Complexity and Computability Theory I

Complexity and Computability Theory I. Lecture #10 Instructor: Rina Zviel-Girshin Lea Epstein. Overview. Regular grammars Examples Conversion of an NFA to a Regular Grammar Conversion of a Regular Grammar to an NFA Chomsky grammar hierarchy Operations over grammars

748 views • 60 slides

The Chomsky Hierarchy

The Chomsky Hierarchy. Unrestricted Grammars:. Productions. String of variables and terminals. String of variables and terminals. Example unrestricted grammar:. Theorem:. A language is recursively enumerable if and only if is generated by an unrestricted grammar.

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Theory of Computation

Theory of Computation. Decidability Recursive and Recursively Enumerable Languages. Source of Slides: Introduction to Automata Theory, Languages, and Computation By John E. Hopcroft, Rajeev Motwani and Jeffrey D. Ullman And

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Learning PCFGs: Estimating Parameters, Learning Grammar Rules

Learning PCFGs: Estimating Parameters, Learning Grammar Rules. Many slides are taken or adapted from slides by Dan Klein. Treebanks. An example tree from the Penn Treebank. The Penn Treebank. 1 million tokens In 50,000 sentences, each labeled with A POS tag for each token

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Linguistic Background Lexical Category, Logic, Syntax, Grammar

Linguistic Background Lexical Category, Logic, Syntax, Grammar. Lexical category (also word class, lexical class , or in traditional grammar part of speech )

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Turing Machines

Turing Machines. Intro to Turing Machines. A Turing Machine (TM) has finite-state control (like PDA), and an infinite read-write tape . The tape serves as both input and unbounded storage device. The tape is divided into cells , and each cell holds one symbol from the tape alphabet .

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MA/CSSE 474 Theory of Computation

MA/CSSE 474 Theory of Computation. Enumerability Reduction. Your Questions?. HW 14 problems Tomorrow's exam Anything else. Previous class days' material Reading Assignments. Enumeration.

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Formal Language Theory

Formal Language Theory. Homework. Read documentation on Graphviz http://graphviz.org/ http://www.graphviz.org/pdf/dotguide.pdf Use graphviz to generate figures like these (more or less):. Back to Regular Expressions. 10 . A more interesting example. import re

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Formal Languages Wrap-up

Formal Languages Wrap-up. Recursively Enumerable Languages. A language is recursively enumerable if there is a Turing Machine that accepts it. This allows the TM to go into an infinite loop if the string is not in the language. Recursive Languages.

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A Hierarchy of Formal Languages and Automata

A Hierarchy of Formal Languages and Automata. How large is the family of languages accepted by Turing machines?. Is there any language that cannot be accepted by Turing machines?. Recursively Enumerable Languages.

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Group Theoretic Decision Problems

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Welcome to the Stanford Automata Theory Course

Welcome to the Stanford Automata Theory Course. Why Study Automata? What the Course is About. Why Study Automata?. A survey of Stanford grads 5 years out asked which of their courses did they use in their job. Basics like intro-programming took the top spots, of course.

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Chapters 11 and 12

Chapters 11 and 12. Decision Problems and Undecidability. 11.1 Decision Problems. A decision problem consists of a set of questions whose answers are either yes or no is undecidable if no algorithm that can solve the problem; otherwise, it is decidable

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Chapters 11 and 12

Chapters 11 and 12. Decision Problems and Undecidability. 11.1 Decision Problems. A decision problem consists of a set of questions whose answers are either yes or no is undecidable if no algorithm that can solve the problem; otherwise, it is decidable

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Chomsky Hierarchy Language Operations and Properties

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The Encoding of TM

The Encoding of TM. Motivation for encoding of TM Languages defined by TM Recursive and recursively enumerable languages ALAN and MATHISON UTM --Universal Turing Machine. Why Encoding of TM?.

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The Encoding of TM

The Encoding of TM. Motivation for encoding of TM Languages defined by TM Recursive and recursively enumerable languages ALAN and MATHISON UTM --Universal Turing Machine. Why Encoding of TM?.

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Course Overview

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