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一阶时滞微分方程正周期解的存在性 被引量:5

Existence of Positive Periodic Solutions for First Order Differential Equations with Delay
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摘要 研究一阶时滞微分方程u'(t)=a(t)e-u(t)u(t)-λb(t)f(u(t-τ(t)))正ω-周期解的存在性,其中a(t),b(t)∈C(R,[0,∞))是ω-周期函数,∫ω0a(t)dt>0,∫ω0b(t)dt>0,f∈C([0,∞),[0,∞)),当u>0时,f(u)>0,τ(t)是连续的ω-周期函数,主要结果的证明基于不动点指数理论. In this paper,the existence of positive ω-periodic solution for the equation is proved u'(t) =a(t)e-u(t)u(t)-λ b(t)f(u(t-τ(t))),where a,b ∈ C(R,[0,∞)) ω-periodic,∫w0a(t)dt 〉 0,∫w0b(t)dt 〉 0,f ∈ C([0,∞),[0,∞)) and f(u) 〉0 for u 〉0,τ(t) is a continuous ω-periodic solution.The proof of the main results is based on the fixed-point index theory.
作者 张露 刘瑞宽
出处 《四川师范大学学报(自然科学版)》 CAS CSCD 北大核心 2014年第5期649-652,共4页 Journal of Sichuan Normal University(Natural Science)
基金 国家自然科学基金(11361054) 甘肃省自然科学基金(1208RJZA258)资助项目
关键词 一阶时滞微分方程 正解 不动点指数 存在性 first order delayed differential equations positive solutions fixed-point index existence
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