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<math> | <math> | ||
\dfrac{\partial I}{\partial V} = \dfrac{1}{H} | \dfrac{\partial I}{\partial V} = \dfrac{1}{H} | ||
</math> | |||
<math> | |||
H'(x) = \left\{ | |||
\begin{array}{l} | |||
0 \; x \le 0\\ | |||
- (R - r) \; 0 < x < 1\\ | |||
0 \; x > 1 | |||
\end{array} | |||
\right. | |||
</math> | </math> |
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