Electron. J. Diff. Eqns., Vol. 2000(2000), No. 13, pp. 1-13.

Oscillation of solutions to delay differential equations with positive and negative coefficients

El M. Elabbasy, A. S. Hegazi, & S. H. Saker

Abstract:
In this article we present infinite-integral conditions for the oscillation of all solutions of first-order delay differential equations with positive and negative coefficients.

Submitted September 6, 1999. Published February 16, 2000.
Math Subject Classifications: 34K15, 34C10.
Key Words: Oscillation, delay differential equations.

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El M. Elabbasy, A. S. Hegazi, & S. H. Saker
Mathematics Department, Faculty of Science
Mansoura University
Mansoura, 35516 EGYPT
e-mail: mathsc@mum.mans.eun.eg
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