Kerodon

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

Remark 1.5.4.2. In the situation of Definition 1.5.4.1, we will often indicate a lifting problem by a commutative diagram

\[ \xymatrix@C =40pt@R=40pt{ A \ar [d]^{f} \ar [r]^-{u} & X \ar [d]^{g} \\ B \ar [r]^-{v} \ar@ {-->}[ur]^{h} & Y, } \]

which includes a dotted arrow representing a hypothetical solution.