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参照した式だけ番号を表示する

ちょっとしたメモ

$\rm\LaTeX$ で参照した式だけ番号を表示したい。

showonlyrefs

参照した式だけ番号を表示するには、 mathtools パッケージを使います。
プリアンブルに

documentclass{jsarticle}
\usepackage{amsmath} % amsmath も必要
\usepackage{mathtools}
\mathtoolsset{showonlyrefs} % 参照した式のみ番号を表示
...
\begin{document}
...

のように書けば、参照した式のみ右端に番号が表示されます。(showonlyrefsshowonlyrefs=true と書いても良い。)

\begin{align}
a & = b \label{ab} \\
c & = d \label{cd} \\
e & = f \label{ef}
\end{align}\eqref{cd} によると...
\begin{align}
a & = b \label{ab} \\
c & = d &&& (1)\label{cd} \\
e & = f \label{ef} 
\end{align}

$\text{式(1)によると...}$

注意

  • \ref ではなく \eqref を使う必要があります。(超重要1
  • \eqref{label} で $(1)$ のように括弧付きで式番号が表示されます。

  1. これを伝えるために書いた記事です。 

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