$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
3.69
\begin{equation} \begin{gathered}\label{equation:connective-Kan-complex-factorization} \xymatrix@R =50pt@C=50pt{ \operatorname{\partial \Delta }^{m} \ar [r] \ar [d] & Y \ar [d]^{f''} \\ \Delta ^{m} \ar [r] \ar@ {-->}[ur] & Z } \end{gathered} \end{equation}