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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 09-18-2 on page 194.
+%% 
+%%  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}{30}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath,graphicx}
+\newcommand*\Sum[1][1]{\ensuremath\mathop{\scalebox{#1}{$\displaystyle\sum$}}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+ \Sum_{i=n}^ma_i\cdot\sum_{j=l}^kb_j &= \Sum[1.2]_{i=n}^m\Sum_{j=l}^ka_ib_j
+\end{align}
+\end{document}