Zhijun Zeng, Li Zhai
Abstract:
With the help of the coincidence degree and the related
continuation theorem, we explore the existence of at least two
periodic solutions of a delayed ratio-dependent predator-prey
system with exploited term. Some easily verifiable sufficient
criteria are established for the existence of at least two
positive periodic solutions.
Submitted December 2, 2006. Published December 3, 2007.
Math Subject Classifications: 34K45, 34K13, 92D25.
Key Words: Ratio-dependent predator-prey system;
periodic solutions; coincidence degree.
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Zhijun Zeng Institute of Systems Science Academy of Mathematics and Systems Sciences Chinese Academy of Sciences, Beijing 100080, China email: zthzzj@amss.ac.cn |
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Li Zhai School of Mathematics and Statistics Southwest University, Chongqing 400715, China email: zl6168@swu.edu.cn |
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