The existence theorem of a class of periodic boundary value problems for first order nonlinear integrodifferential equations is obtained through the method of lower and upper solutions.
研究了一类纯量形式非线性积分微分方程周期边值问题,利用上下解法证明了解的存在性。
A study is made on existence and uniqueness and stability of almost periodic solutions to a class of nonlinear integrodifferential equations with finite time lag.
研究一类具有无限时滞的非线性微分积分方程,其概周期解的存在性、唯一性及稳定性等问题。
We establish a necessary and sufficient condition for the existence of positive solutions of a class of integrodifferential equations with unbounded delay.
我们得到一类带有无界时滞的积分微分方程存在正解的必要充分条件。