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NP (complexity)
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==== Boolean satisfiability ==== The [[Boolean satisfiability problem]] ('''SAT'''), where we want to know whether or not a certain formula in [[propositional logic]] with [[Boolean variable]]s is true for some value of the variables.<ref>{{Cite book|last=Karp|first=Richard|title=Complexity of Computer Computations |chapter=Reducibility among Combinatorial Problems |date=1972|chapter-url=http://cgi.di.uoa.gr/~sgk/teaching/grad/handouts/karp.pdf|pages=85β103 |doi=10.1007/978-1-4684-2001-2_9 |isbn=978-1-4684-2003-6 }}</ref>
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