利用单调迭代方法给出了中立型滞后微分方程的周期边值问题极解的存在性定理。
The monotone iterative techniques is used to investigate the existence of extremal solution of periodic boundary value problems (PBVP) for neutral delay differential equation.
特别地，我们给出二维退化滞后微分方程的周期解的存在性问题，并在最后举例说明其应用。
Particularly, we give the problem of existence of periodic solution of two-dimensional singular differential equation with delay, and give an example to illustrate the main results of this paper.
对带有常数滞后的微分方程系统的控制过程，我们给出了最优性的必要条件。
For control process in the systems of differential equation with constant lag necessary condition of optimality of singular control is found.
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