The concept of sources in electrodynamics and its application to diffraction problems

The concept of electromagnetic field sources consists in consideration of specific function of such values as electrical current density j, polarization P and magnetization J in classical electrodynamics and application thereof for definition and solution development of electrodynamics' problems. Specific function of j, P and J values is associated with the fact that being characteristics of the substance these values may be considered also as sources or origin of electromagnetic field generated by a body within the volume of which they are specified. Representations of Maxwell equations in the form of integrals from values j, P and J over V domain where they are specified as functions of point x ∈ V and time t ∈ (-∞,∞), obtained in this work, are demonstrative validation of this statement.