A brief review is given of the Post symmetries and constraint for covariant electromagnetic constitutive relations which are linear in the fields E and B . Their extension to non-covariant constitutive relations which are linear also in space and time derivatives of E and B is discussed. The Post constraint is compared with published results from multipole theory. It is found that for time-dependent fields in non-magnetic and magnetic substances, and to electric octopole-magnetic quadrupole order, the constraint is satisfied and in agreement with experimental data. For static fields of the magnetoelectric effect, available data do not satisfy this constraint.
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Lange et al. (2001) studied this question.
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