建立它们有解必要和充分条件。
Some necessary and sufficient conditions for a solution to exist a established.
并给出了非线性半定规划的最优性必要和充分条件。
Finally, optimality necessary and sufficient conditions for nonlinear convex semidefinite programming are proved.
首先，区域稳定的必要和充分条件闭环系统的介绍。
Firstly, a necessary and sufficient condition of regional stable for the closed-loop system is introduced.
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