Definition 96.26.1. Let $p : \mathcal{X} \to (\mathit{Sch}/S)_{fppf}$ be a category fibred in groupoids. Let $\mathcal{O}$ be the sheaf of rings on $\mathcal{X}_{affine}$ introduced in Section 96.24. We define the triangulated category of quasi-coherent objects in the derived category by the formula
\[ \mathit{QC}(\mathcal{X}) = \mathit{QC}(\mathcal{X}_{affine}, \mathcal{O}) \]
where the right hand side is as defined in Cohomology on Sites, Definition 21.43.1.
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