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.
函数表达式的类型取决于函数的性质及其参数的类型。
The functional expression's type depends on the nature of the function and type of its arguments.
其次，对真实缺陷轮廓的方向尺寸函数及其特征参数所具有的性质进行了理论分析。
Secondly, the nature of the directional function and the characteristic parameters of real defect Outlines are analyzed in theory.
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