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It has been known through some examples that parameters of an electromagneticmedium can be so defined that there is no dispersion equation (Fresnelequation) to restrict the choice of the wave vector of a plane wave in such amedium, i.e., that the dispersion equation is satisfied identically for anywave vector. In the present paper, a more systematic study to define classes ofmedia with no dispersion equation is attempted. The analysis makes use ofcoordinate-free four-dimensional formalism in terms of multivectors, multiformsand dyadics.

Electromagnetic Media with no Dispersion Equation