机构地区: 华南师范大学数学科学学院
出 处: 《黑龙江大学自然科学学报》 2006年第4期548-552,共5页
摘 要: 讨论了一类具周期系数和时滞的离散互惠系统周期解的存在性问题.通过利用Mawhin重合度理论中的连续性定理,获得了该系统周期正解存在的充分条件,拓展了已有的连续具时滞和差分不具时滞的结果. Consider the existence for periodic solutions of a discrete cooperative system with periodic coefficients and delay. The existence of positive periodic solutions for delay difference equation of a cooperative system is established by using the method of coincidence degree. This improves the existed results of the two cases: continuous model with delay and discrete model without delay.