Department of Mathematics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia
Copyright © 2012 J. Džurina and B. Baculíková. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The aim of this paper is to offer a generalization of the Philos and
Staikos lemma. As a possible application of the lemma in the oscillation
theory, we study the asymptotic properties and oscillation of the th order
delay differential equations . The results obtained utilize also the comparison theorems.