'Eq tm' diaporamas de présentation

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????. ? 6 ? ???????????. REVIEW(20110328). ????. ?? : ????? ???? ?? , ?????? ???? . ?? : E TM , EQ TM , ??????? (PCP), ????????????? , ? . ?? : ?? + ?? ???? , ?? ?? , ????????. REVIEW(20110328). ?? : ???? ???? ?? , ?????? ???? . ?? : ???? B ???????? A ?? .

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Reducibility

Reducibility. A reduction is a way of converting one problem into another problem in such a way that a solution to the second problem can be used to solve the first problem. HALT TM ={<M,w>| M is a TM and M halts on input w} Thm: HALT TM is un-decidable. Proof:

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Mapping Reducibility

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Undecidable Problems From Language Theory

Undecidable Problems From Language Theory. Lecture 33 Section 5.1 Wed, Nov 7, 2007. Reducibility. A problem A is reducible to a problem B if a solution to B gives us a solution to A . More specifically, an instance of problem A can be restated as an instance of problem B .

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Undecidable Problems From Language Theory

Undecidable Problems From Language Theory. Lecture 33 Section 5.1 Wed, Nov 7, 2007. Reducibility. A problem A is reducible to a problem B if a solution to B gives us a solution to A . More specifically, an instance of problem A can be restated as an instance of problem B .

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CSCI 3130: Automata theory and formal languages

Fall 2010. The Chinese University of Hong Kong. CSCI 3130: Automata theory and formal languages. Reducibility. Andrej Bogdanov http://www.cse.cuhk.edu.hk/~andrejb/csc3130. Summary of last lecture. U. program ? M ?. accept , if M accepts w. reject , if M rejects w. input w.

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CSCI 2670 Introduction to Theory of Computing

CSCI 2670 Introduction to Theory of Computing. November 3, 2005. Agenda. Yesterday Reductions (Section 5.3) Today More on reductions Section 6.3 We will not be covering section 6.4 I will discuss some basic issues of this section when covering chapter 7. Announcement.

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CSCI 2670 Introduction to Theory of Computing

CSCI 2670 Introduction to Theory of Computing. November 4, 2004. Agenda. Yesterday Reductions (Section 5.3) Today Section 6.3 We will not be covering section 6.4 I will discuss some basic issues of this section when covering chapter 7. Announcement.

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Lecture 7 Undecidability cont.

Lecture 7 Undecidability cont. Jan Maluszynski , IDA, 200 7 http://www.ida.liu.se/~janma. Outline. (Sipser 5.1,5.3, 6.2) Reducibility Examples of undecidable problems Mapping reducibility Decidability of Logical Theories. Reduction techniques. For proving B is undecidable

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