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Bernstein算子带权同时逼近的点态结果 被引量:3

THE POINTWISE RESULTS OF WEIGHTED SIMULTANEOUS APPROXIMATION BY BERNSTEIN OPERATOR
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摘要 本文给出了Bernstein算子加权同时逼近的点态估计,在此使用的是Jacobi权函数ω(x)=x^a(1-x)~b(0≤a,b<1,a,b不全为零),引入新的加权光滑模ω_(■λ)~2(f,t)_ω,是对以前结果的补充和完善. In this paper, we make use of a new weighted moduli of smoothness ω(φλ)^2(f,t)ω to give a pointwise estimate of weighted simultaneous approximation by Bernstein operator with Jacobi weight. So we supplement and perfect the previous results.
出处 《应用数学学报》 CSCD 北大核心 2005年第3期466-481,共16页 Acta Mathematicae Applicatae Sinica
基金 河北省自然科学基金资助项目(A2004000137号) 河北教育厅和河北师范大学科研基金资助项目
关键词 BERNSTEIN算子 同时逼近 加权光精模 K-泛函 Bernstein operator simultaneous approximation weighted moduli of smoothness K-functional
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  • 1DITZIAN Z,TOTIK V.Moduli of smoothness.Springer-Verlag:NewYork Berlin etc,1987.
  • 2HEILMANN M,MULLER M W.Equivalence of a weighted modulus of smoothness and a modified weighted K-functional,in:Progress in Approximation Theory,Academic Press New York,1991:467-473.
  • 3CAO JIADING.A Generalization of the Bernstein polynomials.J Math Analy & Appl,1997,209:140-146.
  • 4GUO S,TONG H.Pointwise Weighted Approximation by Bernstein Operators.Acta Math Hungar,2003,4:293-311.
  • 5TAKAHASHI W.A convexity in metric space and nonexpansive mappings.Kodai Math Sem Rep,1970,22:142-149.
  • 6Bao-rong WEI,Yi ZHAO.Weighted approximation of functions with singularities by Bernstein operators[J].Journal of Zhejiang University-Science A(Applied Physics & Engineering),2008,9(10):1451-1456. 被引量:8

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