интегральное уравнение integral equation 5 621.3 2 fictitious magnetic charge 2 фиктивный магнитный заряд 2 інтегральне рівняння 2 517.968 1 621.3.013.22 1 diffraction 1 doubly periodic heterogeneous medium 1 electromagnet 1 electrostatic analogy 1 homogenization problem 1 infinite periodic grating 1 infinitely thin ring 1 magnetic forces 1 magnetic moment of the core 1 magnetic permeability tensor 1 magnetization curve 1 magnetization vector 1 matrix 1 non-uniformly magnetized core 1 piecewise homogeneous magnetized medium 1 plane meridian magnetostatic field 1 polygradient separation 1 slot 1 spacecraft control system 1 strength field 1 wave diffraction 1 алгоритм 1