ONE-SIDED N-WIDTHS OF SOME CLASSES OF PERIODIC FUNCTIONS

作     者：Fang Gensun Zhang Jianhua Beijing Normal University,China 

作者机构：Department of Mathematics Beijing Normal University Beijing PRC 

出 版 物：《Analysis in Theory and Applications》 (分析理论与应用（英文刊）)

年 卷 期：1993年第9卷第4期

页      面：21-36页

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

基　　金：Supported by Natural Science Foudatioin of China 

主　　题：Differential Operator Periodic Function Implicit Function Theorem Simple Zero Exact Estimation 

摘      要：In this paper,we determine the exact estimation of one-sided n-widths d_n^+(w_q^r(p_r),L_1).q=1,∝, where W_q^r(P_r)is a class of differentiable 2π-periodic functions,and is determined by a differential opera- tor P_r(D)=D~σ∏_(j=t)~l(D-α_j),σ,j∈N,σ≥2,x_j≠0,x_j∈R.