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
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.
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