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The Stacks project

Lemma 13.30.2. Let F : \mathcal{A} \to \mathcal{B} and G : \mathcal{B} \to \mathcal{A} be functors of abelian categories such that F is a right adjoint to G. Let K^\bullet be a complex of \mathcal{A} and let M^\bullet be a complex of \mathcal{B}. If RF is defined at K^\bullet and LG is defined at M^\bullet , then there is a canonical isomorphism

\mathop{\mathrm{Hom}}\nolimits _{D(\mathcal{B})}(M^\bullet , RF(K^\bullet )) = \mathop{\mathrm{Hom}}\nolimits _{D(\mathcal{A})}(LG(M^\bullet ), K^\bullet )

This isomorphism is functorial in both variables on the triangulated subcategories of D(\mathcal{A}) and D(\mathcal{B}) where RF and LG are defined.

Proof. This is a special case of the very general Lemma 13.30.1. \square


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