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+%%
+%% An UIT Edition example
+%%
+%% Example 06-12-5 on page 109.
+%%
+%% 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{177.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{63}
+\renewcommand\theequation{6.\arabic{equation}}
+\newcommand*\clap[1]{\hbox to 0pt{\hss#1\hss}}
+\newcommand*\mathclap{\mathpalette\mathclapinternal}
+\newcommand*\mathclapinternal[2]{\clap{$\mathsurround=0pt#1{#2}$}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+ X = \sum_{\mathclap{1\le i\le j\le n}}X_{ij}
+\end{align}
+\end{document}