By using the weak maximum principle, the uniqueness and stability of the solution of water vapour equation with the first, second and third boundary-value problems were proven.
利用该弱极大值原理，证明了对于第一类、第二类和第三类边值问题，水汽方程解的唯一性和稳定性。
The trajectory problem was cast as the optimal control problem and Pontriaghin Maximum Principle was used to obtain first order necessary condition.
我们将此弹道问题转化成最优控制问题，通过极大值原理得到最优弹道的一阶必要条件。
The trajectory problem was cast as the optimal control problem and Pontriaghin Maximum Principle was used to obtain first order necessary condition.
我们将此弹道问题转化成最优控制问题，通过极大值原理得到最优弹道的一阶必要条件。
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