where Å¡<sub>ei</sub>(t) and Å¡<sub>mi</sub>(t) denote functions of time that are indeed the inverse Laplace transform of s<sub>ei</sub><sup>-1</sup> and s<sub>mi</sub><sup>-1</sup>,respectively, given by:
:<math> \breve{s}_{ei}(t) = \frac{\delta(t)}{\kappa_{ei}} - \frac{\sigma_{ei}}{\kappa_{ei}^2} u(t)\exp \left[-\left(\frac{\sigma_{ei}}{\kappa_{ei}} + \alpha_{ei} \right)\frac{t}{\varepsilon_0} \right] </math>
Â
:<math> \breve{s}_{mi}(t) = \frac{\delta(t)}{\kappa_{mi}} - \frac{\sigma_{mi}}{\kappa_{mi}^2} u(t)\exp \left[-\left(\frac{\sigma_{mi}}{\kappa_{mi}} + \alpha_{mi} \right)\frac{t}{\mu_0} \right] </math>
[[Image:FDTD97(1).png]]