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+%%
+%% An UIT Edition example
+%%
+%% Example 01-00-2 on page 4.
+%%
+%% 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{413.13629pt}
+\setlength\parindent{0pt}
+\setcounter{equation}{1}
+\renewcommand\theequation{1.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\newcommand\abs[1]{|#1|}
+\StopShownPreambleCommands
+\begin{document}
+\begin{gather}
+\left\lvert\frac{\hat v(s)-\hat v(t)}{\abs{\widetilde{D}u}(\mathinner{\left[t,s\right[})}
+ -\frac{f(\hat u(t)+\dfrac{\widetilde{D}u}{\abs{\widetilde{D}u}}(t)
+ \abs{\widetilde{D}u}(\mathinner{\left[t,s\right[}))-f(\hat u(t))}
+ {\abs{\widetilde{D}u}(\mathinner{\left[t,s\right[})}\right\rvert
+\le K\left\lvert\frac{\hat u(s)-\hat u(t)}{\abs{\widetilde{D}u}(\mathinner{\left[t,s\right[})}
+ -\frac{\widetilde{D}u}{\abs{\widetilde{D}u}}(t)\right\rvert
+\end{gather}
+\end{document}