Turing reducibility

Theory of Computation: Lecture 12. The main topics covered in this lesson include: post correspondence problem; PCP is undecidable; computable functions and examples of computable functions; reducibility;...

42p andromedashun 26-05-2022 8 1   Download

Theory of Computation: Lecture 13. The main topics covered in this lesson include: computable functions; reducibility; reducibility and undecidability; reducibility and un-Turing-recognizability;...

50p andromedashun 26-05-2022 7 1   Download

Theory of Computation: Lecture 14. The main topics covered in this lesson include: reducibility; un-Turing-recognizability; a nice puzzle; programs that print themselves; recursion theorem; programming languages version;...

36p andromedashun 26-05-2022 8 1   Download

Theory of Computation: Lecture 18. The main topics covered in this lesson include: oracle turing machines; turing reducibility; berry paradox; a definition of information; minimal length descriptions; descriptive complexity;...

21p andromedashun 26-05-2022 9 1   Download

Theory of Computation: Lecture 26. The main topics covered in this lesson include: NP-completness; satisfiability; Cook-Levin theorem; 3-colorable; translation algorithm; polynomial-time reducibility; non-deterministic turing machines;...

34p andromedashun 26-05-2022 7 1   Download

We successfully found hundreds of botnets by examin- ing a subset of the spam email messages received by Hot- mail Web mail service. The sizes of the botnets we found range from tens of hosts to more than ten thousand hosts. Our measurement results will be useful in several ways. First, knowing the size and membership gives us a bet- ter understanding on the threat posed by botnets. Second, the membership and geographic locations are useful infor- mation for deployment of countermeasurement infrastruc- tures, such as rewall placement, trafc ltering policies, etc.

9p nhacsihuytuan 06-04-2013 47 8   Download