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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)



Comparison and oscillation theorems for matrix differential inequalitites

Author: E. S. Noussair
Journal: Trans. Amer. Math. Soc. 160 (1971), 203-215
MSC: Primary 35.11; Secondary 34.00
MathSciNet review: 0280846
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Abstract: Strong comparison theorems of Sturm's type are established for systems of second order quasilinear elliptic partial differential equations. The technique used leads to new oscillation and nonoscillation criteria for such systems. Some criteria are deduced from a comparison theorem, and others are derived by a direct variational method. Some of our results constitute extensions of known theorems to nonselfadjoint quasilinear systems.

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Keywords: Matrix differential inequality, oscillatory differential system, oscillation and nonoscillation criteria, strongly oscillatory equation, positive definite matrix
Article copyright: © Copyright 1971 American Mathematical Society

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