摘要
主要讨论了有界函数的导数估计问题 ,得到三阶导数、四阶导数的准确估计式 .
In this paper, We discuss the problem of estimating the derivate of bounded functions. the sharp bounds for the third and forth derivative of bounded functions are given. The main results obtained here generalize several known results.
出处
《纯粹数学与应用数学》
CSCD
2001年第4期358-362,共5页
Pure and Applied Mathematics
关键词
有界函数
导数
正则函数
正实部函数
最大模原理
估计
bounded functions, regular function, estimation, positive real part function, maximum modulus principle
