Proposition 72.11.5. Let $S$ be a scheme. Let $X$ be a quasi-compact algebraic space over $S$ with affine diagonal. Then the functor (72.5.1.1)

is an equivalence with quasi-inverse given by $RQ_ X$.

Proposition 72.11.5. Let $S$ be a scheme. Let $X$ be a quasi-compact algebraic space over $S$ with affine diagonal. Then the functor (72.5.1.1)

\[ D(\mathit{QCoh}(\mathcal{O}_ X)) \longrightarrow D_\mathit{QCoh}(\mathcal{O}_ X) \]

is an equivalence with quasi-inverse given by $RQ_ X$.

**Proof.**
Let $V \to W$ be an étale morphism with $V$ affine and $W$ a quasi-compact open subspace of $X$. Then the morphism $V \to W$ is affine as $V$ is affine and $W$ has affine diagonal (Morphisms of Spaces, Lemma 64.20.11). Lemma 72.11.1 then guarantees that the assumption of Lemma 72.11.4 holds. Hence we conclude.
$\square$

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## Comments (2)

Comment #450 by Pieter Belmans on

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