91.9.1.1
\begin{equation} \label{defos-equation-morphism-thickenings-ringed-topoi} \vcenter { \xymatrix{ (\mathop{\mathit{Sh}}\nolimits (\mathcal{C}), \mathcal{O}) \ar[r]_ i \ar[d]_ f & (\mathop{\mathit{Sh}}\nolimits (\mathcal{D}), \mathcal{O}') \ar[d]^{f'} \\ (\mathop{\mathit{Sh}}\nolimits (\mathcal{B}), \mathcal{O}_\mathcal {B}) \ar[r]^ t & (\mathop{\mathit{Sh}}\nolimits (\mathcal{B}'), \mathcal{O}_{\mathcal{B}'}) } } \end{equation}
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