76.15.0.1
\begin{equation} \label{spaces-more-morphisms-equation-universal-first-order-thickening} \vcenter { \xymatrix{ & Z \ar[ld] & & T \ar[rd] \ar[ll]^ a \\ Z' \ar[rrd] & & & & T' \ar@{..>}[llll]_{a'} \ar[lld]^ b \\ & & X } } \end{equation}
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