Algebraic field descriptions in three-dimensional Euclidean space

Beltrami Vector Fields in Electrodynamics—A Reason for Reexamining the Structural Foundations of Classical Field Physics?

“…As is well known, this transformation has the form of a duality transformation [66][67][68], where, in the above special case, the vectors A₁ and A₂, similar to E and H, are compelled to satisfy Trkalian field relations:…”