It is a difficult problem studying the existence of periodic solutions of differential equation in abstract Spaces.
研究抽象空间微分方程周期解的存在性一直是比较困难的问题。
A new result about existence of periodic solutions of nonlinear differential equations with double resonance will be given.
给出了带有双侧共振的非线性微分方程周期解存在性的一个新的结果。
The purpose of this paper is to study the existence of periodic solutions of a class of second order Hamiltonian Systems ith damping term.
主要研究了一类带有阻尼项的二阶哈密顿系统的周期解的存在性。
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