This article studies an omega-periodic system of Nicholson-type differential equations with nonlinear density-dependent mortality rate. Using the degree theory we obtain sufficient conditions for the existence of a positive omega-periodic solution. Also a result of local asymptotic stability for the periodic solution is obtained by Lyapunov theory. Our results improve previous researches on the subject.
机构:
Hunan Univ Arts & Sci, Coll Math & Comp Sci, Changde 415000, Hunan, Peoples R ChinaHunan Univ Arts & Sci, Coll Math & Comp Sci, Changde 415000, Hunan, Peoples R China