Indeed. Most texts stop at the 4-equation notation that has both electric (E) and magnetic (B) fields, but with a small extension it becomes a single equation, which is lorentz-invariant: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Covariant_formulation_of_classical_electromagnetism#Maxwell.27s_equations_in_the_Lorenz_gauge" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Covariant_formulation_of_class...</a> - I regard it as a much more fundamental and succinct description of how EM fields work.