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177 bytes added ,  02:01, 22 September 2015
Line 560: Line 560:  
<math>
 
<math>
 
   \dfrac{\partial I}{\partial V} = \dfrac{1}{H}  
 
   \dfrac{\partial I}{\partial V} = \dfrac{1}{H}  
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</math>
 +
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<math>
 +
H'(x) = \left\{
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        \begin{array}{l}
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        0 \; x \le 0\\
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        - (R - r) \; 0 < x < 1\\
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        0 \; x > 1
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        \end{array}       
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        \right.
 
</math>
 
</math>
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