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In computational complexity, NP is the complexity class consisting of problems whose yes instances can be verified in polynomial time. NP stands for 'nondeterministic polynomial time '.

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Characterize P^NP (a.k.a. Delta_2^p)

I think MAX_CLIQUE_SIZE is in $P^{NP}$. Class of problems that are Cook-reducible to $NP$ problems. …
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