$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
3.65
\begin{equation} \begin{gathered}\label{equation:connective-as-lifting} \xymatrix@R =50pt@C=50pt{ A \ar [r] \ar [d] & X \ar [d]^{f} \\ B \ar [r] \ar@ {-->}[ur] & Y } \end{gathered} \end{equation}