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<math>V_{ij} = {\gamma\over 2}{( s_{ij} - {s_{ij}}^o)}^2</math>
The second derivatives of the potential,
<math>{\partial^2 V_{ij}\over\partial{x_i}^2} = {\gamma\over {s_{ij}}^2} {(x_j - x_i)}^2 </math>
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