105.6.1.2

\begin{equation} \label{stacks-more-morphisms-equation-morphism} \vcenter { \xymatrix{ & V \ar[ld]_ f \ar[ldd]^ b \ar[rr]_ j & & V' \ar[ld]_{f'} \ar[lddd]^{y'} \\ U \ar[d]_ a \ar[rr]_ i & & U' \ar[dd]_{x'} \\ W \ar[d]_ x & \\ \mathcal{X} \ar[rr] & & \mathcal{X}' } } \end{equation}

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