The Stacks project

Lemma 20.41.4. Let $(X, \mathcal{O}_ X)$ be a ringed space. Given complexes $\mathcal{K}^\bullet , \mathcal{L}^\bullet $ of $\mathcal{O}_ X$-modules there is a canonical morphism

\[ \mathcal{K}^\bullet \longrightarrow \mathop{\mathcal{H}\! \mathit{om}}\nolimits ^\bullet (\mathcal{L}^\bullet , \text{Tot}(\mathcal{K}^\bullet \otimes _{\mathcal{O}_ X} \mathcal{L}^\bullet )) \]

of complexes of $\mathcal{O}_ X$-modules functorial in both complexes.

Proof. Omitted. Hint: This is proved in exactly the same way as More on Algebra, Lemma 15.71.5. $\square$

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