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## Main Question or Discussion Point

Hi

In my book it says that if the dielectric function ε is time invariant, we can write a solution to Maxwells equations of the form E(

Best,

Niles.

In my book it says that if the dielectric function ε is time invariant, we can write a solution to Maxwells equations of the form E(

**r**, t) = E(**r**)exp(jωt). I agree that the ME are separable, but I don't see how they**know**that the time-dependence is harmonic? What is so special about exp(jωt) in this respect?Best,

Niles.

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