Guide to LaTeX (4th Edition) (Tools and Techniques

H.1. Brief description of the L AT E X commands 517
\begin{command name} . . . . . . . . . . . . . . . . . (2.2) – 20
Most declaration commands, such as the font styles and sizes, can be
used as environment names. For example, \begin{small} switches
to font size \small until the countercommand \end{small} is given.
\begin{alltt} . . . . . . . . . . . . . . . . . . . . (4.9.1) – 111
When the alltt package has been loaded, this environment prints
out original text in typewriter typeface, maintaining line breaks, special
symbols, and so on, except for \ { } which function as usual.
This allows commands to be executed within the typewriter text.
\begin{bmatrix} [m][a] . . . . . . . . . . . . . . . (12.2.4) – 266
Like the matrix environment, but enclosed in square brackets [].
\begin{Bmatrix} [m][a] . . . . . . . . . . . . . . . (12.2.4) – 266
Like the matrix environment, but enclosed in curly braces { }.
\begin{cases} [m][a] . . . . . . . . . . . . . . . . (12.2.6) – 277
With the amsmath package, writes math expressions on several lines,
terminated by \\, in left-justified columns, separated by &, with a
curly brace enclosing all lines at the left, the whole being centered
vertically.
\begin{description} . . . . . . . . . . . . . . . . . . (4.3.3) – 70
Start of the environment description to produce an indented list
with labels. The label text is the argument label in the command
\item[label].
\begin{displaymath} . . . . . . . . . . . . . . . . . . (5.1) – 120
Switches from text to displayed math mode for producing a formula
on a line by itself. Functions the same as \[.
\begin{document} . . . . . . . . . . . . . . . . . . . . (1.5.2) – 12
Start of the outermost environment of a text document. This command
terminates the preamble. It is obligatory for every L AT E X document,
as is its counterpart \end{document} for ending the document.
\begin{enumerate} . . . . . . . . . . . . . . . . . . . (4.3.2) – 70
Start of the environment enumerate to produce a numbered, indented
listing. The style of numbering depends on the depth of
nesting; at the first level, it consists of a running Arabic number that
is incremented with each call to \item.
\begin{eqnarray} [m] . . . . . . . . . . . . . . . . . (5.4.7) – 138
Switches from text to displayed math mode to produce a set of equations
or a multiline formula in the form of a three-column table {rcl}.
The individual lines of the formula are ended with the command \\;
the fields within a line are separated by & characters. Each line is
given a sequential equation number unless the command \nonumber
appears within it.