91.4.0.1

\begin{equation} \label{cotangent-equation-pi} \vcenter { \xymatrix{ (\mathop{\mathit{Sh}}\nolimits (\mathcal{C}), \underline{B}) \ar[r]_ i \ar[d]_\pi & (\mathop{\mathit{Sh}}\nolimits (\mathcal{C}), \mathcal{O}) \\ (\mathop{\mathit{Sh}}\nolimits (*), B) } } \end{equation}

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