%0 Journal Article
%T Oscillation of higher order systems of differential equations
%A H. Ogunmez
%A O. Ocalan
%J International Journal of Mathematical Analysis
%D 2013
%I 
%X In this paper, we provide necessary and sufficient conditions for theoscillation of every solution of the system of delay differential equations begin{equation*}x^{(m)}(t)+Px(t-tau )=0,,end{equation*}where $Pin mathbb{R}^{stimes s},$ $tau in mathbb{R}^{+}$ and $m$ is anodd positive integer. Furthermore, we proved sufficient conditions for theoscillation of every solution of the system of delay differential equations begin{equation*}x^{(m)}(t)+sum_{i=1}^{n}P_{i}x(t-tau _{i})=0,end{equation*}where $P_{i}in mathbb{R}^{stimes s},$ $tau _{i}in mathbb{R}^{+}$ for $%i=1,2,...,n$ and $m$ is an odd positive integer.
%K Differential equation
%K oscillation
%K logarithmic norm
%U http://www.m-hikari.com/ijma/ijma-2013/ijma-13-16-2013/ogunmezIJMA13-16-2013.pdf