重新解释界定的合作解，本质上是具有内外稳定性质的一种纳什均衡。
The cooperative solution newly explained and defined is in fact a Nash Equilibrium in nature, which is stable both internally and externally.
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.
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