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+%%
+%% An UIT Edition example
+%%
+%% Example 10-07-7 on page 214.
+%%
+%% 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{201.70511pt}
+\usepackage[utf8]{inputenc}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align*}
+\hat H\left(r,R\right)
+ &= -\frac{1}{2}\sum\limits_{i=1}^N\nabla_i^2 -\frac{1}{2}\sum\limits_{I=1}^M
+ \frac{1}{A_I}\nabla_I^2 +\sum\limits_{i=1}^N\sum\limits_{j>i}^N
+ \frac{1}{\left|r_i-r_j\right|}\\
+ &\mathrel{\phantom{=}}-\sum\limits_{i=1}^N \sum\limits_{I=1}^M
+ \frac{Z_I}{\left|r_i-R_I \right|}+\sum\limits_{I=1}^M \sum\limits_{J>I}^M
+ \frac{Z_I ZJ}{\left|R_I-R_J\right|}
+\end{align*}
+\end{document}