The biharmonic Neumann problem with double involution

This paper studies the solvability of a new class of boundary value problems with nonlocal Neumann conditions for a biharmonic equation in a sphere. Non-local conditions are specified in the form of a connection between the values of the desired function at different points of the boundary. In this case, the boundary operator is determined using matrices of involution-type mappings. The theorem of existence the and uniqueness of the solution is proved and the integral representation of the solution to the problem under consideration is found.