西南石油大学学报(自然科学版) ›› 2000, Vol. 22 ›› Issue (1): 87-89.DOI: 10.3863/j.issn.1000-2634.2000.01.024

• 基础理论 • 上一篇    下一篇

特殊正弦三角级数最佳逼近的讨论

肖伟
  

  1. 西南石油学院计科系,四川 南充 637001;浙江大学数学系,杭州 310028
  • 收稿日期:1998-10-26 修回日期:1900-01-01 出版日期:2000-02-20 发布日期:2000-02-20
  • 通讯作者: 肖伟

ON THE BEST APPROXIMATION BY SPECIAL TRIGONOMETRICAL SERIES

XIAO Wei
  

  1. Southwest Petroleum Inst
  • Received:1998-10-26 Revised:1900-01-01 Online:2000-02-20 Published:2000-02-20
  • Contact: XIAO Wei

摘要:

讨论了以2π为周期的连续函数空间中奇函数f(x)的最佳逼近问题:如果f(x)的傅立叶系数

{bn}n=1是O-正则拟单调的,则En(f)≈max k≥1kbn+k.


关键词: 最佳逼近, Fourier系数, O-正则拟单调

Abstract: This paper investigated the best approximation for odd function f(x)∈C2πby trigonometrical series, the conclusion was drawn: if Fourier Coefficients on f(x) is O regularly varying quasimonotone , then.

Key words: best approximation, Fourier coefficient, O-regularly varying quasimonotone

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