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3.4: Permittividad compleja
https://espanol.libretexts.org/Ingenieria/Libro%3A_Electromagnetica_II_(Ellingson)/03%3A_Propagaci%C3%B3n_de_Ondas_en_Medios_Generales/3.04%3A_Permittividad_compleja
\[\begin{align} \widetilde{\bf D} &= a_0\widetilde{\bf E} + a_1\left(j\omega\right)\widetilde{\bf E} + a_2\left(j\omega\right)^2\widetilde{\bf E} + a_3\left(j\omega\right)^3\widetilde{\bf E} + ... \no... $\begin{align} \widetilde{\bf D} &= a_0\widetilde{\bf E} + a_1\left(j\omega\right)\widetilde{\bf E} + a_2\left(j\omega\right)^2\widetilde{\bf E} + a_3\left(j\omega\right)^3\widetilde{\bf E} + ... \nonumber \\ &= a_0\widetilde{\bf E} + j\omega a_1\widetilde{\bf E} - \omega^2 a_2\widetilde{\bf E} - j\omega^3 a_3\widetilde{\bf E} + ... \nonumber \\ &= \left(a_0 + j\omega a_1 - \omega^2 a_2 - j\omega^3 a_3 + ... \right) \widetilde{\bf E} \end{align} \nonumber$

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