Lemma 85.22.3. Let \mathcal{C} be a site with fibre products and X \in \mathop{\mathrm{Ob}}\nolimits (\mathcal{C}). Let \mathcal{O}_\mathcal {C} be a sheaf of rings. Let U be a hypercovering of X in \mathcal{C}. Then we have a canonical isomorphism
R\Gamma (X, E) = R\Gamma ((\mathcal{C}/U)_{total}, La^*E)
for E \in D(\mathcal{O}_\mathcal {C}).
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