The investigation of the existence of positive solutions of neutral delay differential equations with impulses is devoted by using the Banach cotraction principle. 摘要利用压缩映射原理，讨论了中立型脉冲时滞微分方程正解的存在性。
The asymptotic behavior of solutions for a class of delay differential systems was studied. 摘要研究了一类时滞微分系统解的渐近性态。
