%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 8-2-3 on page 470.
%%
%% 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}
\StopShownPreambleCommands
\begin{document}
\begin{equation}
  x^2 + y^2  =  z^2
\end{equation}
\begin{align}
  x^2 + y^2 &=  z^2 \\
  x^3 + y^3 &<  z^3
\end{align}
\begin{eqnarray}
  x^2 + y^2 &=& z^2 \\
  x^3 + y^3 &<& z^3
\end{eqnarray}
\end{document}