%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 3-5-4 on page 178.
%%
%% 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{231.0pt}

\addtolength\textwidth{-30pt}
\newcommand\sample{ Some text to experiment
                  with line numbering.}
\StartShownPreambleCommands
\usepackage[displaymath,mathlines]
                    {lineno}
\linenumbers
% \sample as defined before
\StopShownPreambleCommands
\begin{document}
\sample \[ x \neq y \] \sample\par
\sample
\begin{displaymath}
   x \neq y
\end{displaymath}
\sample
\end{document}