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-<html>
-<head><title>Help On LaTeX Math Formulas</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">Math Formulas</font></h1>
-<p>
- There  are four environments  that  put LaTeX  in math  mode:  
-<ul><li><a href="#math">math</a> (see below)
-    <li><a href="ltx-421.html">displaymath</a>
-    <li><a href="ltx-223.html">eqnarray</a>
-    <li><a href="ltx-224.html">equation</a>
-</ul>
- All four of these environments are typeset in math  
- <a href="ltx-130.html">mode</a>, using a math italic font and  LaTeX
- ideas about spacing in math mode.  (See also <a href="mathfonts.html">math
- fonts and styles</a>.)
-<p>
- The math environment is for formulas that
- appear right in the text.  The displaymath, eqnarray, and equation
- environments are for formulas that apppear on their own line(s). 
- The math environment  can be used in both paragraph  and LR mode,  but
- displaymath, eqnarray,  and  equation  environments  can  be  used  only  
- in paragraph  mode.
-
-<h2><a name="math">Math environment</a></h2>
- The math environment may be specified, as with all environments, by
-<pre>
-  <tt>\begin{math}  math equation \end{math}</tt>
-</pre>
- However, it is used so often that it has two equivalent shorter forms:
-<pre>
-  <tt>\( math equation \)</tt> 
-</pre>
-or just
-<pre>
-  <tt>$ math equation $</tt>
-</pre>
-In <a href="versions.html">LaTeX2e</a> one can also use
-<pre>
-  <tt><a href="ensuremath.html">\ensuremath</a>{math equation}</tt>
-</pre>
-<p>
-For example, 
-<a href="ltx-179.html">Subscripts</a> and 
-<a href="ltx-180.html">superscripts</a> can only be used in math
-mode. To include these in running text one could use:
-<pre>
-  <tt>The formula for water is H$_2$O.
-  If the hypotenuse is $c$, then $c^2=a^2+b^2$.</tt>
-</pre>
-Note that it is standard to use math mode for letters, such as the
-the <tt>$c$</tt> above, which are math variables.
-<hr>
-<h2>Related topics</H2>
-<ul>
-<li><a href="ltx-421.html">Displaymath environment</a>
-<li><a href="ltx-223.html">Eqnarray environment</a>
-<li><a href="ltx-224.html">Equation environment</a>
-<p>
-<li><a href="ltx-130.html">LaTeX Modes</a>
-<p>
-<li><a href="mathfonts.html">Math fonts and styles</a>
-<li><A href="ltx-179.html">Subscripts</A> and 
-    <a href="ltx-180.html">Superscripts</a>
-<li><A href="ltx-117.html">Math Symbols</A>
-<li><A href="ltx-118.html">Spacing in Math Mode</A>
-<li><A href="ltx-119.html">Math Miscellany</A>
-<li><a href="ellipses.html">Ellipses</a>
-<p>
-<li><a href="boldmath.html"><tt>\boldmath</tt></a> for a bold math font
-<li><a href="ltx-235.html"><tt>\frac</tt></a> for generating built-up fractions
-<li><a href="stackrel.html"><tt>\stackrel</tt></a> for putting things above 
-   each other
-<li><a href="ltx-319.html"><tt>\sqrt</tt></a> for square (and nth) roots
-</ul>
-<p>
-Back to the <a href="ltx-2.html">Table of Contents</a>
-<hr>
-<address>
-Revised: Sheldon Green, 31 May 1995.
-</address>
-</body>
-</html>