The beauty of Maxwell's system of equations lies in both physics and mathematics. Physically, it completely explains the roots of (classical) electromagnetic phenomena: in the static case: electric charge produces an electric field (Gauss Law), and electric current produces a magnetic field (Ampere Law); and in the dynamic case: a varying electric field can produce a magnetic field (Maxwell-Ampere Law), and a varying magnetic field can also produce an electric field (Faraday Law). So, (classical) electromagnetic phenomena can be explained by the fact that electric charge, and the motion of that charge (electric current), produces an electric field, a magnetic field, and changing electric and magnetic fields (electromagnetic fields). Mathematically, the equations are in a simple form, but they are not perfectly symmetrical, because the magnetic field has no source (magnetic mononuclear). And, the entire four differential equations, all expressed in terms of dispersion and spin, can also be unified as the generalized Stokes' theorem (in differential geometry). Further, after Einstein introduced tensor analysis into the physics system, the original four differential equations can be simplified into two more concise tensor equations (not pictured). Further, after the establishment of overall differential geometry (exoalgebra), in exo-differential form, the system of Maxwell's equations can be expressed in an extremely simple equation, with, of course, a constraint (Bianchi identity) by default. Here, it is not as simple as simply writing just one equation, but allows us to make a more convenient generalization, which, after the introduction of the non-commutative Lie algebra again, leads directly to the Yang-Mills field equations, so that the electromagnetic phenomena are just a special form of the more generalized physical framework. The beauty of their symmetry stems mainly from the fact that the magnetic field is a spatial effect and the electric field is a temporal effect. Electromagnetism can be interconverted. Electromagnetic fields are covariant under representation with respect to the Lorentz transformations of special relativity. Therefore the electromagnetic field this set of vectors is a set of vectors in four-dimensional space (rank 1 tensor). It is natural to write it in a form about time and space differentiation that satisfies particularly good properties.