%% 
%%  An UIT Edition example
%% 
%%  Example 06-03-18 on page 96.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage{amsmath,array}
\StopShownPreambleCommands
\begin{document}
\begin{tabular}{@{}*{3}{>{\ttfamily}rc}@{}}
\textrm{\emph{environment}} & \emph{example}
  & \textrm{\emph{environment}} & \emph{example}
  & \textrm{\emph{environment}} & \emph{example} \\\hline
\rule{0pt}{0.7cm}
Vmatrix     & $\begin{Vmatrix}a & b\\c & d\end{Vmatrix}$ &
Bmatrix     & $\begin{Bmatrix}a & b\\c & d\end{Bmatrix}$ &
matrix      & $\begin{matrix}a & b\\ c & d\end{matrix}$\tabularnewline
\rule{0pt}{0.8cm}vmatrix & $\begin{vmatrix}a & b\\ c & d\end{vmatrix}$&
bmatrix     & $\begin{bmatrix}a & b\\c & d\end{bmatrix}$ &
pmatrix     & $\begin{pmatrix}a & b\\c & d\end{pmatrix}$\tabularnewline[10pt]
smallmatrix & $\begin{smallmatrix}a & b\\c & d\end{smallmatrix}$
\end{tabular}
\end{document}