Remark 3.5.4.16. Let $f: X \rightarrow Y$ be a morphism of simplicial sets which exhibits $Y$ as a weak $n$-coskeleton of $X$. Then $f$ is $(n+1)$-connective. See Corollary 3.5.2.2.
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
Remark 3.5.4.16. Let $f: X \rightarrow Y$ be a morphism of simplicial sets which exhibits $Y$ as a weak $n$-coskeleton of $X$. Then $f$ is $(n+1)$-connective. See Corollary 3.5.2.2.