69.5.10.1

\begin{equation} \label{spaces-limits-equation-to-show-cartesian} \vcenter { \xymatrix{ X_ i \ar[d] & U_ i \ar[l] \ar[d] \\ \mathop{\mathrm{Spec}}(A_ i) & \mathop{\mathrm{Spec}}(B_ i) \ar[l] } } \end{equation}

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