Equations of electrodynamics: Final essence of EM phenomena

The sets of all the basic equations, relating in the two directions the three pairs of EM quantities, are considered and compared. The tensor equations point to 4D space, as the ambient of EM phenomena. The remaining equations enable the tensor interpretation of all the quantities. The quantities of the same ranks are related algebraically, and the orders of the differential equations accord to the differences of the related ranks. The equations are interpreted in the terms of mechanics of some super-fine quantum fluid, in 4D space.