Electronic Journal of Differential Equations,
Vol. 2000(2000), No. 13, pp. 1-13.

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

Authors: El M. Elabbasy (Mansoura Univ., Mansoura, Egypt)
 A. S. Hegazi (Mansoura Univ., Mansoura, Egypt)
 S. H. Saker (Mansoura Univ., Mansoura, Egypt)
  
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.