摘要
本文讨论了一类具有无穷时滞的泛函微分方程N′(t)=-a(t)N(t)+b(t)integral from n=0 to∞(K(s)e^(-q(t)N(t-s)))ds,t(?)0,(*)正概周期解的存在唯一性和全局吸引性问题,利用锥中不动点定理,不仅得到了上述系统的正概周期解的存在唯一性和全局吸引性的结论,还改进了文献[15]的主要结果,并且我们的方法比压缩映象原理要好.如果(*)中所有的系数都为周期的,相应的结论也是成立的,此时,我们的结果也推广了现有文献的结论.
In this paper, a class of population differential equation with infinite delay as follows
N′(t)=-α(t)N(t)+b(t)∫0^∞K(s)e^-q(t)N(t-s)ds,t≥0,
is disscussed. Sufficient conditions of the existence and uniqueness of positive almost periodic solutions N(t) are obtained by using a fixed pointed in cone. Also, global attractivity of N(t) is studied. Some existing results are improved greatly.
出处
《生物数学学报》
CSCD
北大核心
2008年第3期449-456,共8页
Journal of Biomathematics
基金
国防科技大学预研基金(0602)
关键词
正概周期解
时滞
全局吸引性
锥
Positive almost periodic solution
Delay
Global attractivity
Cone