Although the set of 1-form constitutive equations shown above are the ones that follow most naturally from the covariant 2-form constitutive equation G = ⋆ ⋆ χ χ F , they are not the only possibility. Indeed, the traditional 3-vector formulation of the constitutive equations usually relates B → → and H → → by B → → = μ μ H → → . Therefore, it could be desirable to rearrange the preceding set of relations into