CS341 Lecture Notes - Nsw Trainlink V Set, Correspondence Problem, Natural Number
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16 Oct 2011
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We have seen various np-complete problems that take up exponential time for their solution: but we cannot seem to prove that this is necessary. There are other problems which are intractable but can be proven to be intractable: that is: there is a proof that the minimum time must be exponential in the size of the input. Examples: the towers of hanoi problem, chess: the game tree for chess grows exponentially. There are problems that cannot be solved by any algorithm (even if exponential time is allowed): notions of computability: In our discussion of computability we will utilize some programming language l: l is to be defined later, we will show that there are problems for which there is no algorithm possible, expressed in this language l. We will also have an associated set of legal inputs for a problem: a proposed solution of a problem must successfully work for all such inputs.
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