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%%
%% Ein Beispiel der DANTE-Edition
%% Mathematiksatz mit LaTeX
%% 2. Auflage
%%
%% Beispiel 10-04-8 auf Seite 221.
%%
%% 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{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage{amsmath}
\newcommand*\num[1]{\hphantom{#1}} \newcommand*\vsp{\vphantom{\rangle_1}}
\StopShownPreambleCommands
\begin{document}
\begin{equation*}
\frac{300}{5069} \underbrace{\longmapsto}_{%
\substack{\Delta a=271\num9\vsp \\[2pt]
\Delta b=4579\vsp\\[2pt]
\text{$1$ iteration}}} \frac{29}{490}%
\underbrace{\longmapsto \frac{19}{321}\longmapsto}_{%
\substack{\Delta a=10\num{9}=\langle271\rangle_{29}\num{20}\\[2pt]
\Delta b=169=\langle4579\rangle_{490}\\[2pt]
\text{$2$ iterations}}}\frac{9}{152}
\underbrace{\longmapsto \frac{8}{135}\longmapsto\dots\longmapsto}_{%
\substack{\Delta a=1\num{7}=\langle10\rangle_{9}\num{119}\\[2pt]
\Delta b=17=\langle169\rangle_{152}\\[2pt]
\text{$8$ iterations}}}\frac{1}{16}
\underbrace{\longmapsto\dots\longmapsto}_{%
\substack{\Delta a=0=\langle1\rangle_{1}\num{76} \\[2pt]
\Delta b=1=\langle17\rangle_{16} \\[2pt]
\text{$8$ iterations}}}\frac{1}{1}
\end{equation*}
\end{document}
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