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+<head>
+<title>UK TeX FAQ -- question label mathonlyref</title>
+</head><body>
+<h3>Numbers for referenced equations only</h3>
+<p/>There are those who consider that papers look untidy with numbers on
+every equation; there is also a school of thought that claims that
+there should be numbers everywhere, in case some reader wants to make
+reference an equation to which the author made no cross-reference.
+<p/>If you hold to the &ldquo;only cross-referenced&rdquo; school of thought, you
+can (using the <code>\</code><code>nonumber</code> command on the relevant equations, or by
+using the AMSLaTeX unnumbered environments such as
+<code>equation*</code>) mark those of your equations to which you
+make no reference. In a long or complex paper, this procedure could
+well become deeply tedious.
+<p/>Fortunately, help is at hand: the <i>mh</i> bundle&rsquo;s
+<i>mathtools</i> package offers a &lsquo;<code>showonlyrefs</code>&rsquo;
+switch through its <code>\</code><code>mathtoolsset</code> command; when that&rsquo;s in
+operation, only those equations to which you make reference will be
+numbered in the final output. See the package&rsquo;s documentation for
+details of how to make references when the switch is in effect.
+<dl>
+<dt><tt><i>mathtools.sty</i></tt><dd>Distributed as part of <a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/mh.zip">macros/latex/contrib/mh</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/mh.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/mh/">browse</a>)
+</dl>
+<p/><p/><p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=mathonlyref">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=mathonlyref</a>
+</body>