Yongkun Li, Tianwei Zhang, Jianfeng Suo
Abstract:
Using the Leggett-Williams multiple fixed point theorem,
we establish criteria for the existence of three positive
periodic solutions of a class of differential systems with
feedback controls on time scales.
Submitted March 25, 2010. Published August 20, 2010.
Math Subject Classifications: 34K13.
Key Words: Positive periodic solutions; feedback controls;
time scales; Leggett-Williams multiple fixed point theorem.
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Yongkun Li Department of Mathematics, Yunnan University Kunming, Yunnan 650091, China email: yklie@ynu.edu.cn |
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Tianwei Zhang Department of Mathematics, Yunnan University Kunming, Yunnan 650091, China email: 1200801347@stu.ynu.edu.cn |
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Jianfeng Suo Department of Mathematics, Yunnan University Kunming, Yunnan 650091, China email: jfsuo@ynu.edu.cn |
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