引入相应的格林空间随机系统，应用格林空间投影理论和新息分析方法，得到了不定二次型的最小值及其存在条件。
Then, by introducing a corresponding Krein space stochastic system and applying projection and innovation analysis, the minimum of indefinite quadratic form and its existence condition are derived.
它说了什么呢？它是三维空间中通量的格林公式。
这里的“格林”和格林公式的“格林”是同一个人，因为这是格林公式在空间中的表述。
The Green here is the same Green as in Green's theorem, because somehow that is a space version of Green's theorem.
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