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<*complexity*> A set or property of computational search problems. A problem is NP-hard if solving it in polynomial time would make it possible to solve all problems in class
NP in polynomial time.

Some NP-hard problems are also in NP (these are called "NP-complete"), some are not. If you could reduce an NP problem to an NP-hard problem and then solve it in polynomial time, you could solve all NP problems.

See also computational complexity.

[Examples?]

(1995-04-10)

Nearby terms: np « NPC « NP-complete « **NP-hard** » NP-hilarious » NPL » NPPL

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