The Existence of Periodic Solutions for a Kind of High-Order Functional Differential Equation
具偏差变元的高阶泛函微分方程的周期解存在性问题

In this paper, by using the theory of Fourier series, Bernoulli number theory andcontinuation theorem of coincidence degree theory, we study a kind of high-order functional differential equations with a deviating argument is considered. Some new results on the existence of periodic solutions are obtained.