$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
4.85
\begin{equation} \begin{gathered}\label{equation:connective-Kan-complex-factorization-categorical} \xymatrix@R =50pt@C=50pt{ \operatorname{\partial \Delta }^{m} \ar [r] \ar [d] & \operatorname{\mathcal{D}}' \ar [d]^{U} \\ \Delta ^{m} \ar [r] \ar@ {-->}[ur] & \operatorname{\mathcal{D}}} \end{gathered} \end{equation}