fix_rhok.tex
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	\documentclass[12pt]{article}

	\begin{document}

	\begin{eqnarray*}
	U &=& \frac{1}{2} K (\|\rho_{\vec{k}}\| - a)^2 \\
	\rho_{\vec{k}} &=& \sum_j^N \exp(-i\vec{k} \cdot \vec{r}_j )/\sqrt{N} \\
	\vec{k} &=& (2\pi n_x /L_x , 2\pi n_y /L_y , 2\pi n_z/L_z )
	\end{eqnarray*}

	\end{document}