凹函数凸函数

Concave function Convex function

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1
研究与凸函数对应的凹函数及其性质，并指出了凹函数在最优化中的应用。
In this paper, concave function and its properties are discussed. And concave function's application in optimization are shown as well.
2
在有效前沿上，风险是收益的严格单调递增凸函数，收益是风险的严格单调递增凹函数。
On the effect boundary, risk is return's rigid monotony increase by degrees convex function , return is risk's rigid monotony increase by degrees concave function.

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