%\documentclass{article}
%\setlength\parindent{0pt}
%\usepackage{graphicx}
%\usepackage{subfigure}
%\usepackage{multirow}
%\usepackage{miller}
%\usepackage{amsmath}
%\usepackage{pbox}
%\newcommand{\vect}[1]{\boldsymbol{\mathrm{#1}}}
%
%\title{Force Fields}
%\date{}
%\begin{document}
%
%\maketitle
%%
%\begin{center}
%\huge{\textbf{Force Fields}}
%\end{center}
%%
%\normalsize{}
\section{Force Fields}

\subsection{Dual Lattice Force Fields}

Currently, only one force field is implemented to optimise a structure's dual lattice. The total energy of a system is given by the sum of pair interaction energies:

\begin{center}
%\begin{equation}
%$ \phi(r_{ij})  =  \sum r_{ij}^{-1} $
$ \displaystyle \phi = \sum_{i=1}^{N_{D}}\sum_{j=i+1}^{N_{D}}\frac{1}{| \vect{r_i}-\vect{r_j}| } $ 
%\end{equation}
\end{center}



%\end{document}


    
