92.21.0.1

\begin{equation} \label{cotangent-equation-to-solve-ringed-spaces} \vcenter { \xymatrix{ 0 \ar[r] & \mathcal{G} \ar[r] & {?} \ar[r] & \mathcal{O}_ X \ar[r] & 0 \\ 0 \ar[r] & \mathcal{J} \ar[u]^ c \ar[r] & \mathcal{O}_{S'} \ar[u] \ar[r] & \mathcal{O}_ S \ar[u] \ar[r] & 0 } } \end{equation}

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