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On a boundary value problem for a sixth order equation with non-negative characteristic form. (Russian) Zbl 0485.35027


MSC:

35G15 Boundary value problems for linear higher-order PDEs
35P20 Asymptotic distributions of eigenvalues in context of PDEs
35A05 General existence and uniqueness theorems (PDE) (MSC2000)
35D05 Existence of generalized solutions of PDE (MSC2000)