Opuscula Math. 31, no. 2 (2011), 257-267
http://dx.doi.org/10.7494/OpMath.2011.31.2.257
Opuscula Mathematica
Four positive periodic solutions of a discrete time Lotka-Volterra competitive system with harvesting terms
Xinggui Liu
Yaping Ren
Yongkun Li
Abstract. In this paper, by using Mawhin's continuation theorem of coincidence degree theory, we establish the existence of at least four positive periodic solutions for a discrete time Lotka-Volterra competitive system with harvesting terms. An example is given to illustrate the effectiveness of our results.
Keywords: discrete systems, Lotka-Volterra competitive models, coincidence degree, harvesting terms.
Mathematics Subject Classification: 34A34, 39A10.
- Xinggui Liu
- Yunnan Agricultural University, Department of Applied Mathematics, Kunming, Yunnan 650221, People's Republic of China
- Yaping Ren
- Yunnan University of Finance and Economics, Statistics and Mathematics college, Kunming, Yunnan 650221, People's Republic of China
- Yongkun Li
- Yunnan University, Department of Mathematics, Kunming, Yunnan 650221, People's Republic of China
- Received: 2010-04-19.
- Revised: 2010-06-08.
- Accepted: 2010-06-15.
