A Two-Point Boundary Problem for Ordinary Self-Adjoint Differential Equations of Fourth Order

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Abstract
The purpose of this note is to establish Theorem A below for the two-point homogeneous vector boundary problem where the Pi(x) are given real m × m symmetric matrix functions of x with P0(x) positive definite and Pi(x) of class C2−i on an infinite interval [a, ∞), and where by a solution of (1.1) — (1.2) for a ≤ x1 < x2 < ∞ we understand a real m-dimensional column vector u = u(x) of class C2 on [a, ∞) which is such that Pi(x)u(2−i) is of class C2−i on [a, ∞) and which satisfies (1.1) — (1.2) with the former a vector identity on [a, ∞).

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