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\documentstyle[12pt]{article}
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\begin{document}
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$$
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E = 2 \pi \epsilon \left[ \frac{2}{5} \left(\frac{\sigma}{r}\right)^{10} -
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\left(\frac{\sigma}{r}\right)^4 -
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\frac{\sqrt(2)\sigma^3}{3\left(r+\left(0.61/\sqrt(2)\right)\sigma\right)^3}\right]
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\qquad r < r_c
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$$
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\end{document} |