Abstract
Let (1.1) where pkC(α, β) and - ∞ ≦ α < β ≦ ∞ . A solution of (1.1) is a nontrivial function yCn(α, β), a neighborhood of β is an interval of the form (γ, β), α ≦ γ < β, and a neighborhood of α is an interval of the form (α, γ), α < γ ≦ β.

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