Vector Delay Differential Equations

Ravi P. Agarwal, Leonid Berezansky, Elena Braverman and Alexander Domoshnitsky
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Ravi P. Agarwal: Texas A&M University—Kingsville, Department of Mathematics
Leonid Berezansky: Ben-Gurion University of the Negev, Department of Mathematics
Elena Braverman: University of Calgary, Department of Mathematics
Alexander Domoshnitsky: Ariel University Center of Samaria, Department of Computer Sciences and Mathematics

Chapter Chapter 9 in Nonoscillation Theory of Functional Differential Equations with Applications, 2012, pp 207-239 from Springer

Abstract: Abstract Chapter 9 is devoted to nonoscillation of systems of delay differential equations. Wazewski’s result claims that a solution of the vector differential equation is not less than a solution of the differential inequality if and only if the off-diagonal entries of the matrix are nonpositive. This property is discussed for vector delay equations; a sufficient condition is nonnegativity of the fundamental matrix. It is also demonstrated that nonpositivity of the off-diagonal entries, generally, is not necessary for the Wazewski property for linear systems with delays. The chapter includes sufficient positivity conditions for the fundamental matrix, comparison theorems, nonoscillation is also investigated for higher-order scalar delay differential equations. Positivity results are applied to construct estimates for the fundamental matrix and solutions, and to study stability; in particular, positivity of the fundamental matrix implies exponential stability of the vector delay differential equation, under some quite natural restrictions. Most of the results of the chapter are extended to systems with a distributed delay.

Keywords: Vector Differential Delay Equations; Fundamental Matrix; Wazewski; Exponential Stability; Non-oscillatory Property (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1007/978-1-4614-3455-9_9

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