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CSP stands for the constraint satisfaction problem.

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Ladner's Theorem vs. Schaefer's Theorem

Otherwise, ${\bf CSP}(\Gamma)$ is ${\bf NP}$-complete. … In his "Final Comments" section, he says "Thus, if a problem is in ${\bf NP} \setminus {\bf P}$ but it is not ${\bf NP}$-complete then it can not be formulated as CSP". …
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