94.6.0.1
\begin{equation} \label{algebraic-equation-representable} \vcenter { \xymatrix{ V_ y \ar@{~>}[r] \ar[d]_{f_ y} & (\mathit{Sch}/V_ y)_{fppf} \ar[d] \ar[r] & \mathcal{X} \ar[d]^ f \\ U \ar@{~>}[r] & (\mathit{Sch}/U)_{fppf} \ar[r]^-y & \mathcal{Y} } } \end{equation}
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