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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>
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