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.

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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.

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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.

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