'Tape symbol' diaporamas de présentation

Decidable Languages

Decidable Languages. Recall that:. A language is Turing-Acceptable if there is a Turing machine that accepts. Also known as: Turing-Recognizable or Recursively-enumerable languages. For any string :. halts in an accept state .

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The Satisfiability Problem

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Undecidability

Undecidability. Everything is an Integer Countable and Uncountable Sets Turing Machines Recursive and Recursively Enumerable Languages. Integers, Strings, and Other Things. Data types have become very important as a programming tool.

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Decidable

Decidable. A problem P is decidable if it can be solved by a Turing machine T that always halt. (We say that P has an effective algorithm.) Note that the corresponding language of a decidable problem is recursive . Undecidable.

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Theory of Computation

Theory of Computation. Theory of Computation. What is possible to compute? We can prove that there are some problems computers cannot solve There are some problems computers can theoretically solve, but are intractable (would take too long to compute to be practical). Automata Theory.

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Introduction to the Theory of Computation

Introduction to the Theory of Computation. Fall Semester, 2011-2012 School of Information, Renmin University of China. Contact Information. Instructor : Dr. Chunlai Zhou( ??? ) Email : czhou@ruc.edu.cn Office : 203A, Wing Building of Science Complex, Tel: 62510042

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CS21 Decidability and Tractability

CS21 Decidability and Tractability. Lecture 9 January 27, 2014. Outline. Turing Machines and variants multitape TMs nondeterministic TMs Church-Turing Thesis decidable, RE, co-RE languages. Turing Machines. New capabilities: infinite tape can read OR write to tape

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Decidability

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