Kerodon

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

Remark 3.6.1.4. If $X$ and $Y$ are finite simplicial sets, then the coproduct $X \coprod Y$ is also finite.