$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
9.1
\begin{equation} \begin{gathered}\label{equation:filtered-via-colimits-precise2} \xymatrix { \mathscr {F}_{01} \ar [r] \ar [d] & \mathscr {F}_{0} \ar [d] \\ \mathscr {F}_{1} \ar [r] & \mathscr {F} } \end{gathered} \end{equation}