74.11.1.1
\begin{equation} \label{spaces-descent-equation-cube} \vcenter { \xymatrix{ Y \times _ Z Z' \times _ Z X \ar[dd] \ar[rr] \ar[rd] & & Z' \times _ Z X \ar '[d][dd]^{f'} \ar[rd] \\ & Y \times _ Z X \ar[dd] \ar[rr] & & X \ar[dd]^ f \\ Y \times _ Z Z' \ar '[r][rr] \ar[rd] & & Z' \ar[rd] \\ & Y \ar[rr] & & Z } } \end{equation}
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