15 lines
518 B
TeX
15 lines
518 B
TeX
\documentclass[preview]{standalone}
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\usepackage{varwidth}
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\usepackage[utf8x]{inputenc}
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\usepackage{amsmath,amssymb,amsthm,bm}
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\begin{document}
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\begin{varwidth}{50in}
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\begin{equation}
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\vec{F}^{i} = \sum_{j}^{Neighbor} \frac{\partial {J} \left(r_{ij} \right)}{
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\partial r_{ij}} \left( \vec{s}_{i}\cdot \vec{s}_{j} \right) \vec{r}_{ij}
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~~{\rm and}~~ \vec{\omega}^{i} = \frac{1}{\hbar} \sum_{j}^{Neighbor} {J}
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\left(r_{ij} \right)\,\vec{s}_{j} \nonumber
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\end{equation}
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\end{varwidth}
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\end{document}
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