% mod_tex: distributed LaTeX-rendering over Apache % Copyright (C) 2007 Peter Danenberg % See doc/COPYING for details. \documentclass[12pt]{article} \usepackage{amsmath,stmaryrd,amssymb} \usepackage{cancel} \usepackage{color} \pagestyle{empty} \begin{document} \begin{displaymath} H = \sum\limits_{i=1}^N \frac{\vec p^2_i}{2m_i} + \sum\limits_{i,j, i\neq j}V(\vec r_i , \vec r_j) \end{displaymath} \end{document}