# Kerodon

$\Newextarrow{\xRightarrow}{5,5}{0x21D2}$ $\newcommand\empty{}$

Example 7.1.5.5. Let $U: \operatorname{\mathcal{C}}\rightarrow \operatorname{\mathcal{D}}$ be a functor of $\infty$-categories. Then an object $C \in \operatorname{\mathcal{C}}$ is $U$-final if and only if it is a $U$-limit diagram when viewed as a morphism of simplicial sets $(\emptyset )^{\triangleleft } \simeq \Delta ^0 \rightarrow \operatorname{\mathcal{C}}$. Similarly, $C$ is $U$-initial if and only if it is a $U$-colimit diagram when viewed as a morphism of simplicial sets $(\emptyset )^{\triangleright } \simeq \Delta ^0 \rightarrow \operatorname{\mathcal{C}}$.