1. new minimax inequality theorem is established,which will be used to study theexistence problems of solutions for quasi-variational inequalities on paracompact sets.
   建立了一类新的极大极小不等式，并利用它们讨论了仿紧集上的拟变分不等式。
2. Approximate rollability for the semilinear heat equation is got by this way that linearing the system by variational approach and constructing functional and using dual equation.
   通过对系统进行线性化，构造泛函，利用对偶方程给出控制函数的具体形式，从而得到系统相应的能控性。
3. In this paper, some general theorems and variational principles of the boundary value problem for two time instants in nonlinear elastodynamics are developed.
   本文给出了非线性弹性动力学两时端边值问题的某些一般定理及变分原理。
4. We discuss the uniform stability and equiasymptotical stability of solutions of nonlinear differential systems by using variational systems. We improve some results in 1～3.
   利用非线性微分系统的变分系统,讨论了非线性微分系统解的一致稳定性和等度渐近稳定性,改进了文献[1~3]中相应的结果.Approximate rollability for the semilinear heat equation is got by this way that linearing the system by variational approach and constructing functional and using dual equation.
   通过对系统进行线性化，构造泛函，利用对偶方程给出控制函数的具体形式，从而得到系统相应的能控性。

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