Merge branch 'master' into grem-feature

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\begin{document}

\begin{eqnarray*}

  V_{ij}  & =  & f_C(r_{ij}) \left[ f_R(r_{ij}) + b_{ij} f_A(r_{ij}) + c_0 \right]

\end{eqnarray*}

\end{document}

\begin{document}

\begin{document}

$$

$$

   P = \frac{N k_B T}{V} + \frac{\sum_{i}^{N} r_i \bullet f_i}{dV}

   P = \frac{N k_B T}{V} + \frac{\sum_{i}^{N'} r_i \bullet f_i}{dV}

$$

$$

\end{document}

\end{document}

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