Here, "a" represents the set of decision attributes and their values, and "c" represents a kind of class label.

其中：“A”代表数据集中决策属性取值的集合，“C”代表某个类标号。

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This paper defines a kind of derivative for real function on convex set which is in linear space. By means of the derivative we study convexity of function and obtain some decision theories.

本文对线性空间中的凸集上的实值函数定义一种导数，用其研究函数凸性，得到了上述三种凸函数的若干判定定理。

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