$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
5.61
\begin{equation} \begin{gathered}\label{equation:classifier-infinity5} \xymatrix@R =50pt@C=50pt{ \operatorname{TW}( \operatorname{\mathcal{E}}/ \operatorname{\mathcal{C}}) \ar [r] \ar [d]^{\theta } & \operatorname{\mathcal{M}}\ar [d]^{\overline{\theta }} \\ \operatorname{TW}(\operatorname{\mathcal{E}}_0 / \operatorname{\mathcal{C}}_0) \ar [r] & \operatorname{\mathcal{M}}_0. } \end{gathered} \end{equation}