Stability of equilibrium in an oligopoly market has important implications. This paper focuses on the stability condition of equilibrium by using contraction mapping and fixed point principle.

在一个由少数制造商控制的市场中，平衡点的稳定性有着重要的应用。本文应用压缩映照及不动点原理给出平衡点稳定的一些条件。

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Using the fixed point principle and the theory of differential inequality, we prove the existence of the solution and an uniformly valid asymptotic expansions of the solution is given as well.

利用不动点原理及微分不等式理论，我们证明了边值问题解的存在性，并给出了解的一致有效渐近展开式。

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To this end the current multipath estimation delay locked loop(MEDLL) was investigated and improvements were proposed based on the zero-point fixed principle.

为了消除扩频系统中的多径干扰，文章基于稳态零点不变的原则对多径估计延迟锁相环（MEDLL）进行研究及改进。

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