Cross-References in Display Mathematics

$\DeclareMathOperator{\homop}{Hom} \newcommand{\Hom}[2]{\homop\left(#1,\,#2\right)} \newcommand{\lt}{<} \newcommand{\gt}{>} \newcommand{\amp}{&} \definecolor{fillinmathshade}{gray}{0.9} \newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}} $

Subsection 4.9.7 Cross-References in Display Mathematics

A cross-reference is achieved with the <xref> element, see Section 3.4. You can place an <xref> inside a <mrow>, and remarkably, it will do the right thing. This is one of only two XML elements you can mix-in with LaTeX syntax. A typical use is to provide a justification or explanation for a step in a proof, derivation, or simplification. And it works best with alignment, see below.

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Subsection 4.9.7 Cross-References in Display Mathematics