论文部分内容阅读
In this paper,the existence of nonconstant oscillating periodic solution of differential difference e-quation with n time lags is stutied:x′(t)=-g(x(t))[f(x(t-τ1))+f(x(t-τ2))+…+f(x(t-τn))] the results of Paper[1-6] are extended and improved.