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Oscillation and nonoscillation of higher order self-adjoint differential equations

Ondřej DošlýJan Osička — 2002

Czechoslovak Mathematical Journal

Oscillation and nonoscillation criteria for the higher order self-adjoint differential equation ( - 1 ) n ( t α y ( n ) ) ( n ) + q ( t ) y = 0 ( * ) are established. In these criteria, equation ( * ) is viewed as a perturbation of the conditionally oscillatory equation ( - 1 ) n ( t α y ( n ) ) ( n ) - μ n , α t 2 n - α y = 0 , where μ n , α is the critical constant in conditional oscillation. Some open problems in the theory of conditionally oscillatory, even order, self-adjoint equations are also discussed.

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