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+%%
+%% Ein Beispiel der DANTE-Edition
+%% Mathematiksatz mit LaTeX
+%% 2. Auflage
+%%
+%% Beispiel 10-06-1 auf Seite 223.
+%%
+%% Copyright (C) 2012 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{190.324pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\let\dst\displaystyle
+\StopShownPreambleCommands
+\begin{document}
+\begin{align*}
+\prod_{k\ge0}\dfrac{1}{(1-q^kz)} &=
+ \dfrac{\dst\sum_{n\ge0}z^n}
+ {\dst\prod_{1\le k\le n}(1-q^k)}
+\end{align*}
+\end{document}