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\section{Theory}  \documentclass{article}  \usepackage{amsmath}  \usepackage{tensor}  \begin{document}  Gaus's Law is in free space is \[\nabla\cdot\vec{E}=\frac{\rho}{\epsilon_0}\]. In a plasma $\epsilon_0$ becomes a tensor for $\epsilon$ and the relation becomes \[\nabla\cdot(\epsilon\vec{E})=\rho\] and noting that $\vec{E}=-\nabla\phi$ and tensor $\kappa=\tensor{\epsilon}\epsilon_0$, Gaus's Law can be rewritten as \[\vec{D}=\epsilon_0(tensor)\kappa\cdot\vec{E}\] \end{document}