摘要
上凸函教是一类重要函数,本文给出了上凸函数的两个充要务件,并用二进制小数、有理数列逼近无理数的方法证明了这两个充要条件。
The upward convex function is important. In this paper,the two necessary and sufficient conditions of the upward convex function is given, and then the proof is provided by the binary fraction and the approximation by rational numbers.
关键词
上凸函数
充要条件
二进制
有界
连续
upward convex function
necessary and sufficient condition
binary system
boundary
continuity
