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$$ U ( \mathbf{A}_1, \mathbf{A}_2, \mathbf{r}_{12} ) = U_r (

\mathbf{A}_1, \mathbf{A}_2, \mathbf{r}_{12}, \gamma ) \cdot \eta_{12} (

\mathbf{A}_1, \mathbf{A}_2, \upsilon ) \cdot \chi_{12} ( \mathbf{A}_1,

\mathbf{A}_2, \mathbf{r}_{12}, \mu ) $$

$$ U_r = 4 \epsilon ( \varrho^{12} - \varrho^6) $$

$$ \varrho = \frac{\sigma}{ h_{12} + \gamma \sigma} $$

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$$ \epsilon_a = \sigma \cdot { \frac{a}{ b \cdot c } }; \epsilon_b =

\sigma \cdot { \frac{b}{ a \cdot c } }; \epsilon_c = \sigma \cdot {

\frac{c}{ a \cdot b } } $$

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