$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
7.91
\begin{equation} \begin{gathered}\label{equation:cartesian-transformation-in-spaces} \xymatrix { \operatorname{Fun}_{ / \operatorname{\mathcal{C}}}( \Delta ^1, \operatorname{\mathcal{E}}' ) \ar [r]^{\Gamma \circ } \ar [d] & \operatorname{Fun}_{ / \operatorname{\mathcal{C}}}( \Delta ^1, \operatorname{\mathcal{E}}) \ar [d] \\ \operatorname{Fun}_{ / \operatorname{\mathcal{C}}}( \{ 1\} , \operatorname{\mathcal{E}}' ) \ar [r]^{\Gamma \circ } & \operatorname{Fun}_{ / \operatorname{\mathcal{C}}}( \{ 1\} , \operatorname{\mathcal{E}}) } \end{gathered} \end{equation}