Kerodon

$\Newextarrow{\xRightarrow}{5,5}{0x21D2}$ $\newcommand\empty{}$
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$

Remark 1.2.1.2 (The Classifying Space of a Category). Let $\operatorname{\mathcal{C}}$ be a category. Then the topological space $| \operatorname{N}_{\bullet }(\operatorname{\mathcal{C}}) |$ is called the classifying space of the category $\operatorname{\mathcal{C}}$.