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

			\begin{document}

			$$
			\kappa = \frac{V}{k_B T^2} \int_0^\infty \langle J_x(0) J_x(t) \rangle \, dt
			= \frac{V}{3 k_B T^2} \int_0^\infty \langle \mathbf{J}(0) \cdot \mathbf{J}(t) \rangle \, dt
			$$

			\end{document}