20.25.3.2

\begin{equation} \label{cohomology-equation-needs-signs} \text{Tot}\left( \text{Tot}(\check{\mathcal{C}}^\bullet ({\mathcal U}, {\mathcal F}^\bullet )) \otimes _{\mathbf Z} \text{Tot}(\check{\mathcal{C}}^\bullet ({\mathcal U}, {\mathcal G}^\bullet )) \right) \longrightarrow \text{Tot}( \check{\mathcal{C}}^\bullet ({\mathcal U}, \text{Tot}({\mathcal F}^\bullet \otimes {\mathcal G}^\bullet ) )) \end{equation}

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