相关期刊:《Acta Mathematicae Applicatae Sinica》《Acta Mathematica Scientia》《Journal of Ocean Engineering and Science》《Chinese Quarterly Journal of Mathematics》更多>>
In this paper, we investigate a class of higher order delay differential equation x(n)(t)+p(t)x(t-t)=0 where is an even positive integer,p()C([to,=()]). We obtain a new oscillation condition for this class.
The aim in this paper is to cite instances in illustration of the incorrectness of certain oscillation theorems in Yan [1] . We also point out that the proof of the main theorems in [ 1 ] is not true, and express our ...