In this paper, we study the definition of semi continuous function and the sufficient conditions of semi continuity, obtain some properties of semi continuous function.
给出了半连续函数的定义，研究了函数具有半连续性的条件，推出了半连续函数的一些性质。
In the paper, the definition and properties of converse function are proposed. It is proved to a few theorems on converse function.
本文给出了逆函数的定义，介绍了它的性质，并证明了关于逆函数的几个定理。
The separability showing the difference of the collective is defined and then based on this definition, the separability function and three of its properties are given.
文中首先定义了反映总体间区别的总体可分性，然后在此基础上给出了总体可分性函数，并且讨论了该函数的三个性质。
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