【摘要】 利用Mawhin重合度理论研究了具有稀疏效应和Beddington-DeAnge- lis功能性反应的捕食者-食饵系统的正周期解的存在性问题,得到了该生物系统正周期解存在的一个充分条件,推广了相关文献的某些已知结果．更多还原

【Abstract】 By using the continuation theorem based on coincidence degree theory,the existence of positive periodic solution for a periodic predator-prey system with sparse effect and Beddington-DeAngelis functional response is studied in this paper.A sufficient condition is derived about it,which improve some known results.更多还原