Аңдатпа
The solvability of one class of Neumann-type problems for non homogeneous polyharmonic equation in the unit ball is investigated. It is established that the set of necessary solvability conditions of the problem obtained earlier is also a set of sufficient conditions. The obtained conditions are in the form of orthogonality of homogeneous harmonic polynomials of certain degrees to linear combinations of boundary functions with coefficients from the Neumann integer triangle.