97.10.0.1

\begin{equation} \label{criteria-equation-hom} \vcenter { \xymatrix{ T \times _{a, B} Z \ar[rd] \ar[rr]_ b & & T \times _{a, B} X \ar[ld] & Z \ar[rd] & & X \ar[ld] \\ & T \ar[rrr]^ a & & & B } } \end{equation}

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