Reformulating the Christoffel equation in polarization variables shows a given polarization yields 1-4 slowness vectors unless degenerate, and identifies subsets of triclinic media where some polarization directions are impossible for any plane wave.
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Christoffel equation in the polarization variables
Reformulating the Christoffel equation in polarization variables shows a given polarization yields 1-4 slowness vectors unless degenerate, and identifies subsets of triclinic media where some polarization directions are impossible for any plane wave.