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+<html>
+<head>
+<title>LaTeX 2.09 and LaTeX2e</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">LaTeX 2.09 and LaTeX2e</font></h1>
+
+<p>The following information is excerpted from "A Document Preparation System:
+LaTeX" by Leslie Lamport, 2nd edition and/or "LaTeX2e for authors",
+by the LaTeX3 Project Team, June 1994.</p>
+
+<p>LaTex2e was produced in an attempt to reconcile the various, sometimes
+incompatble, "flavors" of LaTeX which were developing. Some of these
+included the New Font Selection Scheme (NFSS), SLITeX (for slides),
+AASTeX (the American Astronomical Society macros), etc. The major
+change to LaTeX2e is the method for trying to make the use of add-on
+packages more uniform by the introduction of "classes"
+and "packages." Most of the new commands are the "initial" commands,
+i.e., those which can appear only <em>before</em> the
+<tt>\documentclass</tt> command.</p>
+
+<p>A few standard LaTeX commands have been modified and a few new commands
+added, notably:</p>
+
+<ul>
+ <li><a href="ltx-18.html"><tt>\newcommand</tt></a> (and related) commands,
+ which now allow for an optional argument in newly defined commands
+ <li><a href="ensuremath.html"><tt>\ensuremath</tt></a>
+</ul>
+
+
+<h2>Document Styles and Style Options</h2>
+
+<p>In LaTeX2e, documents begin with a <tt>\documentclass</tt> command. This
+replaces the LaTeX 2.09
+<a href="ltx-22.html"><tt>\documentstyle</tt></a> command. The
+<tt>\usepackage</tt> command has been added and is used in conjunction
+with <tt>\documentclass</tt>.</p>
+
+<p> aTeX2e still understands the old
+<a href="ltx-22.html"><tt>\documentstyle</tt></a> command; if it is
+encountered, LaTex2e enters <em>compatibility
+mode</em> in which most 2.09 input files should still be processed properly.</p>
+
+
+<h2>Type Styles and Sizes</h2>
+
+<p>LaTeX 2.09 commands for changing type style, for example, <tt>\tt</tt>,
+still work similarly in LaTeX2e.
+The major difference is that <tt>\sc</tt> and <tt>\sl</tt>
+can no longer be used in math mode (except when LaTeX2e is in
+<em>compatibility mode</em>, see above).</p>
+
+<p>However, <a href="fonts2e.html">a new set of commands</a>
+have been added to allow separate (and independent) specification of </p>
+
+<ul>
+ <li>Shape
+ <li>Series
+ <li>Family
+</ul>
+
+<p>These can be combined to form a wide variety of type styles. If a style
+you specify is not available on your computer, LaTeX2e produce a warning
+message and will substitute a style it thinks is similar.</p>
+
+<hr>
+
+<p>Return to the <a href="index.html">Introduction</a><br>
+Go to the <a href="ltx-2.html">LaTeX Table of Contents</a></p>
+
+<hr>
+
+<address>
+Revised: Sheldon Green, 14 May 1995.
+</address>
+
+
+</body>
+</html>