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CanIExplore

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In the dispersion equation,

[itex]\gamma[/itex]=[itex]\pm[/itex][itex]\sqrt{j\omega\mu(\sigma+j\omega\epsilon)}[/itex]

the textbook states that the conductivity [itex]\sigma[/itex] can be allowed to take on positive or negative values but they don't explain what a negative conductivity would mean.

Thanks!