Kerodon

$\Newextarrow{\xRightarrow}{5,5}{0x21D2}$
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$

Example 1.1.3.8. For any simplicial set $S_{\bullet }$, the $(-1)$-skeleton $\operatorname{sk}_{-1}( S_{\bullet } )$ is empty.