$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
7.6
\begin{equation} \begin{gathered}\label{equation:relative-colimit-pointwise-universal-strong} \xymatrix@R =50pt@C=50pt{ \operatorname{\partial \Delta }^ n \ar [r]^-{ \sigma _0 } \ar [d] & \operatorname{Fun}(B, \operatorname{\mathcal{E}}) \ar [d]^{ U' } \\ \Delta ^ n \ar@ {-->}[ur] \ar [r] & \operatorname{Fun}(A,\operatorname{\mathcal{E}}) \times _{ \operatorname{Fun}(A, \operatorname{\mathcal{D}}) } \operatorname{Fun}(B,\operatorname{\mathcal{D}}) } \end{gathered} \end{equation}