%%
%% An UIT Edition example
%%
%% Example 04-01-6 on page 34.
%%
%% 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
%%
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\setcounter{equation}{4}
\renewcommand\theequation{4.\arabic{equation}}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\StopShownPreambleCommands
\begin{document}
\begin{equation}
x = \left\{
\begin{array}{ l p{0.7\textwidth} }
0 & if A=\ldots\tabularnewline
1 & if B=\ldots\tabularnewline
x & \parbox[t]{0.75\columnwidth}{This text can be as long as you want it
to be, and now it will even wrap onto several lines because of the
\texttt{\textbackslash parbox} used. Isn't that nice. After all it doesn't
look good if the text protrudes into the margin like it did before.}
\end{array}
\right.
\end{equation}
\end{document}
