We studied problems about 2n-order delay differential equations with periodic boundary value using the upper and lower solution method, and established some suffcient conditions for the existence of the solutions of 2n(n≥1)-order periodic boundary value problems.%利用上下解方法研究2n阶时滞微分方程周期边值问题,建立了2n(n≥1)阶时滞微分方程周期边值问题解存在的充分条件.
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