Remark 5.4.1.4. Let $\operatorname{\mathcal{C}}$ be a simplicial set. Then $\operatorname{\mathcal{C}}$ is an $(\infty ,2)$-category if and only if the opposite simplicial set $\operatorname{\mathcal{C}}^{\operatorname{op}}$ is an $(\infty ,2)$-category.
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$