This is one of the most amazing things I ever learned in physics: you can derive Maxwell’s equations from Coulomb’s Law and Einstein’s two special relativity postulates. (I’ve never seen a good derivation of this online — pointers welcome…)https://twitter.com/elonmusk/status/1138858999309144064 …
Or, to get even more pedantic about it, the required assumption is not that magnetic "charges" do not exist, but only that they can be removed from the theory by a "duality rotation" F --> cos(t)F + sin(t)*F, *F --> -sin(t)F + cos(t)*F, where *F is the Hodge dual of F.
is relativistic side effect of 