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%%
%% An UIT Edition example
%%
%% Example 06-12-11 on page 112.
%%
%% 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}{69}
\renewcommand\theequation{6.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{align}
\prod_{j\ge0}\biggl(\sum_{k\ge0}a_{jk}z^k\biggr) = \sum_{n\ge0}z^n\,%
\Biggl(\hspace{-0.3em}% <======!!!
\sum_{\scriptstyle k_0,k_1,\ldots\ge0\atop\scriptstyle k_0+k_1+\cdots=n}
\hspace{-1.2em}% <======!!!
a_{0k_0}a_{1k_1}\ldots\,\Biggr)
\end{align}
\end{document}
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