Example 4.2.1.2. Any isomorphism of simplicial sets is both a left fibration and a right fibration.

$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$

$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$

Example 4.2.1.2. Any isomorphism of simplicial sets is both a left fibration and a right fibration.