# Kerodon

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

Example 4.2.3.12. Let $f: X \rightarrow S$ be a monomorphism of simplicial sets. Then $f$ is a left covering map if and only if it is a left fibration, and a right covering map if and only if it is a right fibration.