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The two postulates of special relativity plus the postulates of conservedcharges, both electric and magnetic, and a resulting linear system aresufficient for the derivation of the generalized vacuum Maxwell equations withboth charges. The derivative admits another set of Maxwell equations forcharges that are the opposite-parity partners of the usual electric andmagnetic charges. These new charges and their photons are parts of the paralleluniverse of dark matter.

Simple derivation from postulates of generalized vacuum Maxwell equations