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2.20: Еліпси та еліпсоїди
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\( g ( \chi ) = \frac{(2-\chi ^2) (1-\chi ^2) - \chi^4 \ln\left[\left(1 + \sqrt{1- \chi^2}\right)/ \chi\right]}{4 \left\{ (1- \chi^2)^{3/2} + \chi^2 (1-\chi^2) \ln\left[(1 + \sqrt{1- \chi^2})/ \chi \r... $g ( \chi ) = \frac{(2-\chi ^2) (1-\chi ^2) - \chi^4 \ln\left[\left(1 + \sqrt{1- \chi^2}\right)/ \chi\right]}{4 \left\{ (1- \chi^2)^{3/2} + \chi^2 (1-\chi^2) \ln\left[(1 + \sqrt{1- \chi^2})/ \chi \right]\right\} }$ для $\chi \leq 1$ $g (\chi) = 1 - \frac{\frac{\chi^4}{(\chi - 1)^{3/2}}sin^{-1}\left(\frac{\sqrt{\chi^2-1}}{\chi}\right)+\frac{\chi^2 -2}{\chi^2 -1 }}{4 \left\{ \frac{\chi^2}{\sqrt{\chi^2-1}}sin^{-1}\left(\frac{\sqrt{\chi^2-1}}{\chi}\right) +1 \right\}}$ для $\chi \geq 1$