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+%%
+%% An UIT Edition example
+%%
+%% Example 06-11-4 on page 106.
+%%
+%% 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[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{54}
+\renewcommand\theequation{6.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\makeatletter
+\let\oldTagForm\tagform@
+\renewcommand\tagform@[1]{\maketag@@@{\ignorespaces*#1*\unskip\@@italiccorr}}
+\makeatother
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+ c^2 &\le a^2 + b^2\label{eq:pyth0}\\
+ \left|\sum_{i=1}^n a_ib_i\right| &\le \left(\sum_{i=1}^n a_i^2\right)^{1/2}
+ \left(\sum_{i=1}^n b_i^2\right)^{1/2}\label{eq:pyth1}
+\end{align}
+\makeatletter\let\tagform@\oldTagForm\makeatother
+\begin{align}\label{eq:pyth2} c^2 &\le a^2 + b^2 \end{align}
+
+A reference to eq.~\eqref{eq:pyth0}, eq.~\eqref{eq:pyth1} and
+eq.~\eqref{eq:pyth2}.
+\end{document}