利用二次型的理论，给出解决多元函数极值问题的另一种方法。
Through the quadratic form theory, another solution to the extremum problem of function of several variables is given.
本文使用二次型的理论进行判断，并将问题扩大为求任意多元函数的极值。
This paper USES the theory of quadratic form to distinguish this problem, not only that, it enlarge to calculate extreme value for function of many variable.
遗憾的是，具有不同厚尾的股票组合的多元极值分布理论，到目前为止仍然是有待解决的问题。
It's regretted that the multi-extremum theory of portfolio selection with different fat tails is still a problem that needs to be resolved.
由于现实中的极值事件往往倾向于同时或相继发生，因此多元极值研究正成为极值统计学的理论前沿和研究热点。
Due to the frequent co-occurrences of extremes, research on multivariate extremes has become the theoretical frontier and focus in extreme value statistics.
由于现实中的极值事件往往倾向于同时或相继发生，因此多元极值研究正成为极值统计学的理论前沿和研究热点。
Due to the frequent co-occurrences of extremes, research on multivariate extremes has become the theoretical frontier and focus in extreme value statistics.
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