forked from lijiext/lammps
18 lines
715 B
TeX
18 lines
715 B
TeX
\documentclass[12pt]{article}
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\begin{document}
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\begin{eqnarray*}
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E & = & \sum_i \sum_{j > i} \phi_2 (r_{ij}) +
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\sum_i \sum_{j \neq i} \sum_{k > j}
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\phi_3 (r_{ij}, r_{ik}, \theta_{ijk}) \\
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\phi_2(r) & = & A \epsilon \left[ B (\frac{\sigma}{r})^p -
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(\frac{\sigma}{r})^q \right]
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\exp \left( \frac{\sigma}{r - a \sigma} \right) \\
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\phi_3(r,s,\theta) & = & \lambda \epsilon \left[ \cos \theta -
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\cos \theta_0 \right]^2
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\exp \left( \frac{\gamma \sigma}{r - a \sigma} \right)
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\exp \left( \frac{\gamma \sigma}{s - a \sigma} \right)
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\end{eqnarray*}
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\end{document} |