forked from lijiext/lammps
12 lines
257 B
TeX
12 lines
257 B
TeX
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\documentclass[12pt]{article}
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\begin{document}
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$$
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E_i = \frac{1}{2} \sum_{j \neq i}
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\frac{q_i q_j {\rm erfc}(\alpha r_{ij})}{r_{ij}} +
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\frac{1}{2} \sum_{j \neq i}
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\frac{q_i q_j {\rm erf}(\alpha r_{ij})}{r_{ij}} \qquad r < r_c
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$$
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\end{document}
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