The invariants of the electromagnetic field
arXiv:1309.4185 · doi:10.1063/1.4868478
Abstract
We present a constructive proof that all gauge invariant Lorentz scalars in Electrodynamics can be expressed as a function of the quadratic ones.
6 pages, no figures, revtex4, New sections I and II. New references added. The construction in sections III,IV,V and in the Appendix is the same as in version 1
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