Abstract
By forming the intersections of the parity and time reversal equivalence classes of physical entities that are represented by differential forms and differential form densities, a number of subsets of discrete symmetry classes for electromagnetic systems can be generated. Only one of these subsets is consistent with elementary thermodynamic arguments for dissipative systems and at the same time yields the notion that both charge and mass are spacetime scalars. This subset is not in correspondence with the two self-consistent presentations that now are implied in the literature.
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Kiehn, R.M. Parity and time inversion symmetries of electromagnetic systems. Found Phys 7, 301–311 (1977). https://doi.org/10.1007/BF00711483
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DOI: https://doi.org/10.1007/BF00711483