Fejer算子逼近导数有界变差的函数  

On the Approximation of Fejer Operators for Functions with Derivatives of Bounded Variation

作　　者：薛银川[1] 

机构地区：[1]宁夏大学数学系

出　　处：《宁夏大学学报（自然科学版）》1992年第4期21-25,共5页Journal of Ningxia University(Natural Science Edition)

摘　　要：本文给出Fej(?)算子对导数为有界变差函数的逼近速度的估计。In this paper, we give the rate of the convergence of the Fejer operators for the functions with derivatives of bounded variation, we obtain the following theorem: let f∈c_(2(?)), f'∈BV[-π, π], then we have for n(?)3 |δn(f; x)-f(x)|≤ 6lnn/n|φ(x+o)-φ(x-o)| where φ(x)=f'(x) and

关 键 词：FEJER算子 有界变差函数 逼近速度 导数 

分 类 号：O174.41[理学—数学]