The necessary condition of a function being an elementary function is that the function is a continuous function in the field of definition.
函数为初等函数的必要条件是函数在定义域内为连续函数。
This paper, using the method of differential equation, proves some characters properties of basic elementary function, and then concludes an equivalent representation about basic elementary function.
运用微积分的方法，对基本初等函数的若干特征性质进行了证明。从而给出了基本初等函数的等价表征。
The main Puspose of this paper is to give a mean formula of L-function by an elementary method.
本文的主要目的是利用初等方法给出l—函数的逆的一个均值公式。
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