Description of electromagnetic processes in a matter in relativistic invariant form

The paper demonstrates that transition from electric displacement vector D to its solenoid equivalent D_· allows constructing dual pair for vector and scalar electromagnetic potentials. Each pair of electromagnetic potentials representing 4-vector in Minkowsky space may be determined by 4-divergence of its antisymmetric tensor with Hertz vectors components, and these tensors are mutually conjugated. This simplifies representations in Minkowsky space of Maxwell equations solutions, Lagrange functions and energy and momentum conservation law and thus enhances description of electromagnetic processes in a matter.