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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 1-3-5 on page 14.
+%%
+%% 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{135.0pt}
+\StartShownPreambleCommands
+\makeatletter % `@' now normal "letter"
+\@addtoreset{equation}{section}
+\makeatother % `@' is restored as "non-letter"
+\renewcommand\theequation{\oldstylenums{\thesection}%
+ .\oldstylenums{\arabic{equation}}}
+\StopShownPreambleCommands
+\begin{document}
+\section{Equations\ldots}
+\begin{equation} (a+b)^2 = a^2 + 2ab + b^2\end{equation}
+\begin{equation} (a-b)^2 = a^2 - 2ab + b^2\end{equation}
+
+\section{\ldots per section}
+\begin{equation} (a+b)(a-b) = a^2 - b^2 \end{equation}
+\end{document}