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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



Oscillation of linear second-order differential systems

Authors: Man Kam Kwong, Hans G. Kaper, Kazuo Akiyama and Angelo B. Mingarelli
Journal: Proc. Amer. Math. Soc. 91 (1984), 85-91
MSC: Primary 34C10
MathSciNet review: 735570
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Abstract: This article is concerned with the oscillatory behavior at infinity of the solution $y:[a,\infty ) \to {{\mathbf {R}}^n}$ of a system of second-order differential equations, $y''\left ( t \right ) + Q\left ( t \right )y\left ( t \right ) = 0$, $t \in [a,\infty )$; $Q$ is a continuous matrix-valued function on $[a,\infty )$ whose values are real symmetric matrices of order $n$; it is assumed that the largest eigenvalue of the matrix $\int _a^t {Q\left ( s \right )ds}$ tends to infinity as $t \to \infty$. Various sufficient conditions are given which guarantee oscillatory behavior at infinity; these conditions generalize those of Mingarelli [C.R. Math. Rep. Acad. Sci. Canada 2 (1980), 287-290, and Proc. Amer. Math. Soc. 82 (1981), 593-598].

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Keywords: Matrix differential equation, oscillation theory, matrix Riccati equation, Riccati inequality
Article copyright: © Copyright 1984 American Mathematical Society