$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
1.10
\begin{eqnarray} \label{equation:relation-semisimplicial-identity2} \widetilde{\sigma }^{j}_{n} \circ \widetilde{\sigma }^{i}_{n+1} & = & \widetilde{\sigma }^{i}_{n} \circ \widetilde{\sigma }^{j+1}_{n+1} \end{eqnarray}