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doi:10.1016/0022-247X(91)90047-4    
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Copyright © 1991 Published by Elsevier Inc.

On the nature of the nonoscillatory solutions of a class of neutral delay differential equations

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Ch. G. Philos and Y. G. Sficas

Department of Mathematics, University of Ioannina, P.O. Box 1186, 451 10, Ioannina, Greece


Received 8 August 1989. 
Submitted by V. Lakshmikantham 
Available online 30 June 2004.

Abstract

Consider the neutral delay differential equation

, (E) where p, q, τ, σ1, and σ2 are nonnegative constants. For τ less-than over equal to σ2, we prove that all nonoscillatory solutions of (E) are bounded if and only if: (C) The characteristic equation λ + pλe−λτ + q(e−λσ1e−λσ2) = 0 (*) of (E) has no positive roots and zero is a simple root if (*). We also prove that condition (C) is equivalent to 1 + p > q1 − σ2) if τ less-than over equal to σ2. Moreover, for the case where τ > σ2, we show that (C) is a necessary and sufficient condition for every nonoscillatory solution x of (E) to be bounded or such that

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