%% %% Der Mathematiksatz mit LaTeX, 1. Auflage 2009 %% %% Example 10-7-7 on page 227. %% %% Copyright (C) 2009 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. %% \documentclass[]{ttctexa} \pagestyle{empty} \setcounter{page}{6} \setlength\textwidth{194.59192pt} \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}