本文通过建立一个描述利益群体相互作用的微分动力模型，讨论了其均衡解的存在和稳定性条件。
Through building a differential dynamic model which describes interaction among interest-group, this paper discuss the conditions of existence and stability of equilibrium of the model.
证明了在某些条件下系统是持续的，建立了关于相应周期系统正周期解的存在性与稳定性的条件。
Conditions are established for the existence and the stability of the positive periodic solutions with respect to the corresponding periodic system.
本文针对一般非线性系统，在渐近稳定的条件下，得到了完全系统的周期解的存在性、唯一性及收敛性。
In this paper, we obtain the existence, uniqueness and the convergence of a periodic solution of the full system for general nonlinear systems under asymptotically stable conditions.
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