Example 10.3.1.2. Let $\operatorname{\mathcal{C}}$ be a simplicial set. Then the simplicial subsets $\emptyset , \operatorname{\mathcal{C}}\subseteq \operatorname{\mathcal{C}}$ are sieves on $\operatorname{\mathcal{C}}$.
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$