Lemma 85.19.4. Let \mathcal{C} be a site with fibre products and X \in \mathop{\mathrm{Ob}}\nolimits (\mathcal{C}). Let K be a hypercovering of X. Let \mathcal{A} \subset \textit{Ab}((\mathcal{C}/K)_{total}) denote the weak Serre subcategory of cartesian abelian sheaves. Then the functor a^{-1} defines an equivalence
with quasi-inverse Ra_*.
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