International Journal of Mathematics and Mathematical Sciences
Volume 22 (1999), Issue 3, Pages 573-578
doi:10.1155/S0161171299225732

On the oscillation of delay differential equations with real coefficients

H.A. Agwo

Department of Mathematics, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt

Abstract

A set of necessary conditions and another set of sufficient conditions for the oscillation of all the solutions of x˙(t)+∑i=1npix(t−τi)=0,         where   pi∈ℝ,  τi∈ℝ+,    i=1,2,…,n                                   (*) are proved.