Kerodon

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

Remark 3.1.1.8. The collection of Kan fibrations is closed under filtered colimits. That is, if $\{ f_{\alpha }: X_{\alpha } \rightarrow S_{\alpha } \} $ is any filtered diagram in the arrow category $\operatorname{Fun}( [1], \operatorname{Set_{\Delta }})$ having colimit $f: X \rightarrow S$, and each $f_{\alpha }$ is a Kan fibration of simplicial sets, then $f$ is also a Kan fibration of simplicial sets.