%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 8-2-19 on page 478.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% 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.
%%

\documentclass{ttctexamargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}

\StartShownPreambleCommands
\usepackage{amsmath,bm}
\newenvironment{rcase}
    {\left.\begin{aligned}}
    {\end{aligned}\right\rbrace}
\StopShownPreambleCommands
\begin{document}
\begin{equation*}
 \begin{rcase}
 \bm{B}' &=-c\nabla\times\bm{E}            \\
 \bm{E}' &=c\nabla\times\bm{B} - 4\pi\bm{J}\,
 \end{rcase}
 \quad \text {Maxwell's equations}
\end{equation*}
\end{document}