$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
7.11
\begin{equation} \begin{gathered}\label{equation:cofinality-criterion2} \xymatrix@C =50pt@R=50pt{ A \ar [r] \ar [d]^{F} & \Delta ^{0} \diamond A \ar [d] \\ B \ar [r] & \Delta ^0 \diamond B } \end{gathered} \end{equation}