 Linear anisotropic dielectric (source code)

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= Linear anisotropic dielectric

A linear anisotropic medium has constitutive relations $D_i=\varepsilon_{ij}E_j$ and $B_i=\mu_{ij}H_j$. Symmetric, time-independent tensors make the field-energy density a quadratic form.

Here <permittivity> is a tensor, so the electric displacement need not be parallel to the electric field.

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