Updating from master to 19May17

	@( \

		virtualenv -p $(PYTHON) $(VENV); \

		. $(VENV)/bin/activate; \

		pip install Sphinx; \

		pip install Sphinx==1.5.6; \

		pip install sphinxcontrib-images; \

		deactivate;\

	)

\documentclass[12pt]{article}

\usepackage{amsmath}

\begin{document}

$$

   E=\sum_{ij}\phi(r_{ij})+\sum_{i}U(\rho_{i}),

   E=\sum_{i<j}\phi(r_{ij})+\sum_{i}U(n_{i}),

$$

$$

   \rho_{i}=\sum_{j}\rho(r_{ij})+\sum_{jk}f(r_{ij})f(r_{ik})g[\cos(\theta_{jik})]

   n_{i}=\sum_{j}\rho(r_{ij})+\sum_{\substack{j<k,\\j,k\neq i}}f(r_{ij})f(r_{ik})g[\cos(\theta_{jik})]

$$

\end{document}

\documentclass[12pt]{article}

\usepackage{amsmath}

\begin{document}

$$

   E=\sum_{i<j}\phi_{ij}(r_{ij})+\sum_{i}U_i(n_{i}),

$$

$$

   n_{i}=\sum_{j\ne i}\rho_j(r_{ij})+\sum_{\substack{j<k,\\j,k\neq i}}f_{j}(r_{ij})f_{k}(r_{ik})g_{jk}[\cos(\theta_{jik})]

$$

\end{document}