'Post correspondence problem' presentation slideshows

Context Free Grammars

1.4k views • 68 slides

FORMAL LANGUAGES, AUTOMATA AND COMPUTABILITY

15-453. FORMAL LANGUAGES, AUTOMATA AND COMPUTABILITY. A TM = { (M,w) | M is a TM that accepts string w }. HALT TM = { (M,w) | M is a TM that halts on string w }. E TM = { M | M is a TM and L(M) = ? }. REG TM = { M | M is a TM and L(M) is regular}.

720 views • 52 slides

????? ???? ?? ? ????? ??

????? ???? ?? ? ????? ??. ??? ???? Reducibility ?. ??????? ????? ???? ???? 88. Reducibility. A reduction is a way of converting one problem to another problem in such a way that a solution to the second problem can be used to solve the first problem.

603 views • 40 slides

MA/CSSE 474 Theory of Computation

MA/CSSE 474 Theory of Computation. Non-SD Reductions. Your Questions?. HW 15 problems Anything else. Previous class days' material Reading Assignments. Informal Poll: How is your understanding of reductions and proving undecidability?

485 views • 38 slides

Decidability of Languages That Do Not Ask Questions about Turing Machines

742 views • 38 slides

MA/CSSE 474 Theory of Computation

MA/CSSE 474 Theory of Computation. Non-SD Reductions Undecidable problems that are not about Turing Machines. Final Exam and Course evals. Exam Wed 8 AM Covers the entire term, but heavier emphasis on Turing Machines and decidability. Nothing past Chapter 22

362 views • 24 slides

Post's Correspondence Problem Word Problem in semi-Thue Systems

Hector Miguel Chavez Western Michigan University Jun 10, 2009. Post's Correspondence Problem Word Problem in semi-Thue Systems. Post's Correspondence Problem. An instance of the Post's Correspondence Problem (PCP) consists of two lists of strings over some alphabet ?;

384 views • 21 slides