摘要
通过更精确的先验估计,利用重合度理论中的连续定理,研究了一类时滞种群模型的周期解,获得了这类模型存在正周期解的充分条件,所得结果推广了文[1]中的有关结论,并使条件有所减弱.
Using better prior estimate, the theory of Brouwer degree and coincidence degree, the existence of positive periodic solution of a kind of neutral population model is studied. Some sufficient conditions are obtained,which is improvement of the theorem in the reference [1].
出处
《广西大学学报(自然科学版)》
CAS
CSCD
2005年第3期238-241,共4页
Journal of Guangxi University(Natural Science Edition)
基金
国家科技部973项目(1999064911)
关键词
时滞种群模型
正周期解
重合度
delays neutral population model
positive periodic solution
toplogical degree