Periodic solutions for a class of second-order differential delay equations

Periodic solutions for a class of second-order differential delay equations
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一类二阶微分时滞方程的周期解

DOI:
10.3934/cpaa.2021159
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发表时间:
2021
影响因子:
1
通讯作者:
Huafeng Xiao
Huafeng Xiao
中科院分区:
数学4区
文献类型:
--
作者:
Xuan Wu;Huafeng Xiao

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在本文中,我们研究以下微分延迟方程的周期解的存在性 begin{document}$ begin{equation} z^{primeprime}(t) = sumlimits_{k = 1}^{M-1}(-1)^kf(z(t-k)), notag end{equation} $end{document} where begin{document}$ fin C(mathbf{R}^N, mathbf{R}^N) $end{document}, begin{document}$ M,N 在 mathbf{N} $end{document} 和 begin{document}$ M $end{document} 中为奇数。通过利用begin{document}$ S^1 $end{document}-几何索引理论,我们根据渐近线性矩阵在原点和无穷远处的特征值之间的差异来估计周期解的数量。
In this paper, we study the existence of periodic solutions of the following differential delay equations begin{document}$ begin{equation} z^{primeprime}(t) = sumlimits_{k = 1}^{M-1}(-1)^kf(z(t-k)), notag end{equation} $end{document} where begin{document}$ fin C(mathbf{R}^N, mathbf{R}^N) $end{document}, begin{document}$ M,Nin mathbf{N} $end{document} and begin{document}$ M $end{document} is odd. By making use of begin{document}$ S^1 $end{document}-geometrical index theory, we obtain an estimation about the number of periodic solutions in term of the difference between eigenvalues of asymptotically linear matrices at the origin and at infinity.
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