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<math>
a_{\beta}} \int_{v_{\alpha}} \int_{v_{\beta}} \frac {1} {|
\vec{r}_{\alpha} - \vec{r}_{\beta}|} d v_{\alpha} dv_{\beta}
</math>
for volume cell <math>\alpha</math> and <math>\beta</math>. Then, the coefficients of potentials are computed as
<math>
P_{ij} = \frac{1}{S_i S_j} \frac{1}{4 \pi \epsilon_0} \int_{S_i}
\int_{S_j} \frac{1}{|\vec{r}_i - \vec{r}_j|} \; dS_j \; dS_i
</math>
and a resistive term between the nodes, defined as
<math>
R_\gamma = \frac{l_\gamma}{a_\gamma \sigma_\gamma}.
</math>
===PEEC model reduction===
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