庄碧如. 最佳逼近常数的上界的D.Jackson估计[J]. Journal of Xinjiang University (Natural Science Edition in Chinese and English), 1990, (2).DOI:
最佳逼近常数的上界的D.Jackson估计
摘要
本文证明了左半对任何自然数 n 成立
右半当 n≥9时成立;对 n≥4的情形
右端上限应取(17)/(24)n~2+(14)/(24).应用这结果于最佳逼近常数的估计
得到En<4.3286301ω(1/n)
(n≥8) (2)
Abstract
In this paper we give a beautiful inequaity:the left half hold for all natural numbers and right half hald for n≥9.Andapply this result to improve D.Jackson's estimate for the upper bound of besta pp-roximation constant