%% %% An UIT Edition example %% %% Example 10-04-9 on page 207. %% %% 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}} \StartShownPreambleCommands \usepackage{mathtools} \newcommand*\num[1]{\hphantom{#1}} \newcommand*\vsp{\vphantom{\rangle_1}} \StopShownPreambleCommands \begin{document} \begin{equation*} \frac{300}{5069} \underbrace{\longmapsto\vphantom{\frac{1}{1}}}_{% \mathclap{\substack{\Delta a=271\num9\vsp \\[2pt] \Delta b=4579\vsp\\[2pt] \text{$1$ iteration}}}}\frac{29}{490} \underbrace{\longmapsto \frac{19}{321}\longmapsto}_{% \mathclap{\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\vphantom{\frac{8}{135}}}_{% \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}