Formula_12948

\[\begin{gathered}\sigma^{\text {неупр }}=\sum_{l=0}^{\infty} \sigma_{l}^{\text {неупр }}, \\\sigma_{l}^{\text {неупр }}=\pi \lambda^{2}(2 l+1)\left(1-\left|S_{l}\right|^{2}\right) .\end{gathered}\]