%% 
%%  An UIT Edition example
%% 
%%  Example 06-02-6 on page 81.
%% 
%%  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[english]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{225.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\usepackage[english]{babel}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{align*}
  1 & 2 & 3\\  A & B & C
\end{align*}
\end{document}