$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
7.5
\begin{equation} \begin{gathered}\label{equation:relative-colimit-pointwise-existence} \xymatrix@R =50pt@C=50pt{ B \times K \ar [r]^-{ f } \ar [d] & \operatorname{\mathcal{C}}\ar [d]^{U} \\ B \times K^{\triangleright } \ar [r]^-{\overline{g}} \ar@ {-->}[ur]^{ \overline{f} } & \operatorname{\mathcal{D}}} \end{gathered} \end{equation}