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Encyclopedia > Complexity theory

Complexity theory can refer to more than one thing:

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 Computational complexity theory - Wikipedia, the free encyclopedia (1129 words) Complexity theory is part of the theory of computation dealing with the resources required during computation to solve a given problem. Complexity theory differs from computability theory, which deals with whether a problem can be solved at all, regardless of the resources required. The time complexity of a problem is the number of steps that it takes to solve an instance of the problem as a function of the size of the input (usually measured in bits), using the most efficient algorithm.
 Kids.net.au - Encyclopedia Computational complexity theory - (965 words) The time complexity of a problem is the number of steps that it takes to solve an instance, as a function of the size of the instance. The following are some of the classes of problems considered in complexity theory, along with rough definitions. In computing the complexity of an algorithm is a formal notion to describe its "speed".
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