This paper discusses the problem of periodic solution of singular differential equation with delay.

本文讨论退化时滞微分方程的周期解问题。

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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.

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。

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