$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
7.53
\begin{equation} \begin{gathered}\label{equation:detection-criterion-lifting} \xymatrix@R =50pt@C=50pt{ \Lambda ^{m}_{i} \ar [r]^-{ \sigma _0} \ar [d] & \overline{\operatorname{\mathcal{E}}}^{+} \ar [d]^{ \overline{U}^{+} } \\ \Delta ^{m} \ar [r]^-{ \overline{\sigma } } \ar@ {-->}[ur]^{\sigma } & \operatorname{\mathcal{C}}\star \Delta ^{n} } \end{gathered} \end{equation}