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) |