# Kerodon

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

Definition 4.5.1.9. Let $\operatorname{\mathcal{C}}$ and $\operatorname{\mathcal{D}}$ be $\infty$-categories. We will say that a functor $F: \operatorname{\mathcal{C}}\rightarrow \operatorname{\mathcal{D}}$ is an equivalence of $\infty$-categories if the homotopy class $[F]$ is an isomorphism in the homotopy category $\mathrm{h} \mathit{\operatorname{Cat}_{\infty }}$ of Construction 4.5.1.1.