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关于两点Birkhoff插值的一致收敛性

ON THE UNIFORM CONVERGENCE OF THE BIRKHOFF INTERPOLATION WITH TWO POINTS

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【作者】 冯恭已来明骏

【Author】 Feng Gong-ji;Lai Ming-jun Hangzhou University

【机构】 杭州大学杭州大学

【摘要】 <正> 设给定函数F(t),它在[0,1]上有各阶导数,作级数: sum from j=0 to ∞[F2j(0)f2j+1(t)+F2j(1)g2j+1(t)],0≤t≤1, (1)其中f2j+1(t)与g2j+1(t)为[1]中定义的2n+1次多项式。[2]中给出了下述定理: 定理A.已给函数F(t),0≤t≤1。若偶阶导数序列{F2j(t)}在[0,1]上一致有界,即存在M>0,使得

【Abstract】 In the paper "Uniform Convergence of the sequences of Functions {f2j+1(t)} and{g2i+1(t)}", the author has obtained a theorem: The sequence P2n+1(x)=sub from j=0 to n[F2j(0)f2j+1(x)+F2j(1)g2j+1(x)] converges uniformly to F(x) in [0,1], if the sequence of even orderderivatives of F(x) in [0, 1] is bounded uniformly. In this paper, we shall improve the abovetheorem. We shall give the following results: (1) F(x)=P2n+1(x)+F2n+2(ξ)/(2n+2)!φ2n+2(x),where φ2n+2(x) is a polynomial of degree (2n+2). (2) P2n+1(x) and its derivatives convergeuniformly to F(x) and its correlative derivatives in [0, 1] respectively, if F2j(x)=o(22j).

  • 【文献出处】 计算数学 ,Mathematica Numerica Sinica , 编辑部邮箱 ,1984年02期
  • 【被引频次】2
  • 【下载频次】24
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