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+<head>
+<title>UK TeX FAQ -- question label reuseq</title>
+</head><body>
+<h3>Re-using an equation</h3>
+<p/>To repeat an existing equation, one wants not only to have the same
+mathematics in it, one also wants to re-use the original label it had.
+The <i>amsmath</i> package comes to our help, here:
+<blockquote>
+<pre>
+\usepackage{amsmath}
+...
+\begin{equation}
+ a=b
+ \label{eq1}
+\end{equation}
+...
+Remember that
+\begin{equation}
+ a=b
+ \tag{\ref{eq1}}
+\end{equation}
+</pre>
+</blockquote><p>
+Here, the second instance of a=b will be
+typeset with a copy, made by the <code>\</code><code>tag</code> command, of the label of the
+first instance.
+<p/>Comprehensive documentation of AMSLaTeX is to be found in
+<i>amsldoc</i>, in the distribution; it is also available on the web
+at <a href="ftp://ftp.ams.org/pub/tex/doc/amsmath/amsldoc.pdf">ftp://ftp.ams.org/pub/tex/doc/amsmath/amsldoc.pdf</a>
+<dl>
+<dt><tt><i>amsldoc.tex</i></tt><dd>Distributed as part of AMSLaTeX
+ <a href="ftp://cam.ctan.org/tex-archive/macros/latex/required/amslatex.zip">macros/latex/required/amslatex</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/required/amslatex.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/required/amslatex/">browse</a>)
+<dt><tt><i>amsmath.sty</i></tt><dd>Distributed as part of AMSLaTeX
+ <a href="ftp://cam.ctan.org/tex-archive/macros/latex/required/amslatex.zip">macros/latex/required/amslatex</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/required/amslatex.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/required/amslatex/">browse</a>)
+</dl>
+<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=reuseq">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=reuseq</a>
+</body>