%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 3-3-21 on page 142.
%%
%% 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{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{111.0pt}
\addtolength\textwidth{-2pt} % for the example in the book
\StartShownPreambleCommands
\usepackage{ragged2e,amsthm}
\newtheoremstyle{break}%
{9pt}{9pt}% Space above and below
{\itshape\RaggedRight}% Body style
{-12pt}% Heading indent amount
{\sffamily\bfseries}{:}% Heading font and punctuation after it
{\newline}% Space after heading (\newline = linebreak)
{}% Head spec (empty = same as `plain' style)
\theoremstyle{break}
\newtheorem{exa}{Exercise}
\StopShownPreambleCommands
\begin{document}
\begin{exa}[Active author]
Find the author responsible for the largest number of
packages described in The \LaTeX{} Companion.
\end{exa}
\end{document}
