LaTeX 2.09 and LaTeX2e
The following informatin 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.
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 before the
A few standard LaTeX commands have been modified and a few new commands
- \newcommand (and related) commands,
which now allow for an optional argument in newly defined commands
Document Styles and Style Options
In LaTeX2e, documents begin with a \documentclass command. This
replaces the LaTeX 2.09
\documentstyle command. The
\usepackage command has been added and is used in conjunction
LaTeX2e still understands the old
\documentstyle command; if it is
encountered, LaTex2e enters compatibility
mode in which most 2.09 input files should still be processed properly.
Type Styles and Sizes
LaTeX 2.09 commands for changing type style, for example, \tt, still
work similarly in LaTeX2e.
The major difference is that \sc and \sl
can no longer be used in math mode (except when LaTeX2e is in
compatibility mode, see above).
However, a new set of commands
have been added to allow separate (and independent) specification
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.
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Sheldon Green, email@example.com, 14 May 1995.