Example 4.5.9.4. Let $U: \operatorname{\mathcal{C}}\rightarrow \operatorname{\mathcal{B}}$ be a morphism of simplicial sets. Then the projection map $\pi : \operatorname{Fun}( \operatorname{\mathcal{C}}/\operatorname{\mathcal{B}}, \Delta ^0 ) \rightarrow \operatorname{\mathcal{B}}$ is an isomorphism.
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$