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1 \documentclass[12pt]{article}
3 \begin{document}
5 \begin{eqnarray*}
6 \left\{\begin{array}{l}
7 \eta_{ij}=\delta_{ij},\xi_{IJ}=1 \\
8 U_{IJ}\left(r\right)=\frac{D_{e,IJ}}{S_{IJ}-1}\cdot exp\left[-\beta_{IJ}\sqrt{2S_{IJ}\left(r-r_{e,IJ}\right)}\right]\cdot f_{c,IJ}\left(r\right) \\
9 V_{IJ}\left(r\right)=\frac{S_{IJ}\cdot D_{e,IJ}}{S_{IJ}-1}\cdot exp\left[-\beta_{IJ}\sqrt{\frac{2}{S_{IJ}}\left(r-r_{e,IJ}\right)}\right]\cdot f_{c,IJ}\left(r\right) \\
10 F_{IJ}\left(X\right)=\left(1+X\right)^{-\frac{1}{2}} \\
11 P_{IJ}\left(\Delta r\right)=exp\left(2\mu_{IK}\cdot \Delta r\right) \\
12 W_{IJ}\left(r\right)=f_{c,IK}\left(r\right) \\
13 G_{JIK}\left(\theta\right)=\gamma_{IK}\left[1+\frac{c_{IK}^2}{d_{IK}^2}-\frac{c_{IK}^2}{d_{IK}^2+\left(h_{IK}+cos\theta\right)^2}\right]
14 \end{array}\right.
15 \end{eqnarray*}
17 \end{document}