Formula_11175

\[\left.\begin{array}{c}U(\boldsymbol{r})=-V \sum_{n}\left(\left|u_{n}(\boldsymbol{r})\right|^{2} f_{n}+\left|v_{n}(\boldsymbol{r})\right|^{2}\left(1-f_{n}\right)\right), \\\Delta(\boldsymbol{r})=V \sum_{n} u_{n}(\boldsymbol{r}) v_{n}^{*}(\boldsymbol{r})\left(1-2 f_{n}\right), \\f_{n}=\left(\exp \frac{\varepsilon_{n}}{T}+1\right)^{-1},\end{array}\right\}\]