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177 bytes added ,  02:01, 22 September 2015
<math>
\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>
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