Kerodon

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

Remark 3.5.1.4. If $X$ and $Y$ are finite simplicial sets, then the coproduct $X \coprod Y$ is also finite.