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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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How did the Baker-Gill-Solovay paper come to be?
As Buss also said: “Independently in 1975, Baker, Gill, and Solovay exhibited oracles A, B, C, and D such that
\begin{align}
& P^{A} \ne NP^{A}\\
& P^{B} = NP^{B}\\
& P^{C} = NP^{C} \cap coNP^{C} \ne NP … NP$ problem.” …