450. LaTeX技巧208：多行公式的引用，花样编号技巧汇集

演示效果图：

演示代码：

\documentclass{article}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{305.0pt}
\usepackage{CJK}
\usepackage{amsmath}

\begin{CJK}{GBK}{song}
\begin{document}

\begin{align}
x^2+y^2 &= z^2 \label{eq:A}\\
x^3+y^3 &= z^3 \notag\\
x^4+y^4 &= r^4 \tag{$*$}\\
x^5+y^5 &= r^5 \tag*{$*$}\\
x^6+y^6 &= r^6 \tag{\ref{eq:A}$'$}\\
A_1 &= N_0 (\lambda ; \Omega')
\- \phi ( \lambda ; \Omega') \\
A_2 &= \phi (\lambda ; \Omega')
\, \phi (\lambda ; \Omega)
\tag*{ALSO (\theequation)}\\
A_3 &= \mathcal{N} (\lambda ; \omega)
\end{align}
\begin{subequations}\label{eq:1}
\begin{align}f&= g\label{eq:1A} \\
f' &= g'\label{eq:1B} \\
\mathcal{L}f&= \mathcal{L}g \label{eq:1C}
\end{align}
\end{subequations}
\begin{subequations}\label{eq:2}
\renewcommand\theequation{\theparentequation\roman{equation}}
\begin{align}f&= g\label{eq:2A} \\
f' &= g'\label{eq:2B} \\
\mathcal{L}f&= \mathcal{L}g + K\label{eq:2C}
\end{align}
\end{subequations}
Note the relationship between~\eqref{eq:1}
and~\eqref{eq:2}: only~\ref{eq:1C} and~\ref{eq:2C} differ.

\end{CJK}
\end{document}