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Nonlocal problems for higher-order elliptic operators in dihedral and planeangles are considered. The Green formula is obtained, which leads to adjointproblems that take the form of nonlocal transmission problems in dihedral andplane angles. This allows us to establish necessary conditions of Fredholmsolvability and sufficient conditions of one-valued solvability for nonlocalproblems in dihedral angles.

Nonlocal problems for elliptic equations in dihedral angles and the Green formula