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227 bytes added ,  02:00, 22 September 2015
The first thing to do is to change the model from impedance to admittance form
and write the definition of constitutive relation for the internal variable in an "implicit form"
<math>
\left\{
\begin{array}{l}
\dfrac{1}{\mu} \dot{x} + Q(V(t), x(t)) = \dfrac{1}{\mu} \dot{x} - I(t) = 0\\
H(x) = \left\{
\begin{array}{l}
</math>
It is then useful to compute the derivativesfor the current and for the constitutive relation <math> \dfrac{\partial I}{\partial x} = -\dfrac{H'(x)}{H(x)^2} </math> <math> \dfrac{\partial I}{\partial V} = \dfrac{1}{H} </math>
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