21.30.0.1

\begin{equation} \label{sites-cohomology-equation-commutative-epsilon} \vcenter { \xymatrix{ \mathop{\mathit{Sh}}\nolimits (\mathcal{C}_\tau /X) \ar[r]_{f_\tau } \ar[d]_{\epsilon _ X} & \mathop{\mathit{Sh}}\nolimits (\mathcal{C}_\tau /Y) \ar[d]^{\epsilon _ Y} \\ \mathop{\mathit{Sh}}\nolimits (\mathcal{C}_{\tau '}/X) \ar[r]^{f_{\tau '}} & \mathop{\mathit{Sh}}\nolimits (\mathcal{C}_{\tau '}/X) } } \end{equation}

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