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<head><title>Help On LaTeX \lefteqn</title></head>
<body bgcolor="#ffffff" text="#000000" link="#000099" vlink="#cc0000" alink="#cc0000">
<h1><font size="-2">Hypertext Help with LaTeX</font><br><font color="#cc0000">\lefteqn</font></h1>
<p>
<p><pre>
<tt>\lefteqn{eqn}</tt>
</pre>
prints <tt>eqn</tt> in display math style, but pretends that it has
zero width. It is typicaly used within an
<a href="ltx-223.html"><tt>Eqnarray</tt></a> environment for
displaying long equations that require multiple lines.
<p>
A typical use might be
<pre>
<tt>\begin{eqnarray}
\lefteqn{\int_0^<a href="ltx-407.html">\infty</a> some expression =} \\
& & some terms <a href="ltx-181.html">\\</a>
& & <a href="ltx-265.html">\mbox{}</a> + more terms
\end{eqnarray}</tt>
</pre>
Note that the empty <a href="ltx-265.html"><tt>\mbox{}</tt></a> is so LaTeX
knows that the following <tt>+</tt> is a binary operator, and is not
attached to the first of the "more terms" as a unary operator.
<hr>
Related topics
<ul>
<li><A href="ltx-27.html">Environments</A>
<li><a href="ltx-202.html">Array Environment</a>
<li><a href="ltx-223.html">Eqnarray Environment</a>
<li><a href="ltx-224.html">Equation Environment</a>
<li><a href="ltx-421.html">Displaymath Environment</a>
<li><a href="ltx-115.html">Math Formulas</a>
</ul>
Return to <a href="ltx-2.html">LaTeX Table of Contents</a>
<hr>
<address>
Revised: Sheldon Green, 29 Jun 1995.
</address>
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