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一类组合型三角插值多项式
Combinatorial trigonometric interpolation polynomial
【摘要】 构造了一个以{θk=kπ/(n+1)}nk=1为插值结点的f(θ)∈C2π且为奇函数的组合型三角插值多项式算子Sn(f;r,θ)(r为自然数).Sn(f;r,θ)对每个以2π为周期的奇连续函数都能在全实轴上一致收敛到f(θ);并且若f(θ)∈Cj2π(0≤j≤r-1)是奇的,则Sn(f;r,θ)对其收敛阶均达到最佳收敛阶.
【Abstract】 The present paper introduces a combinatorial trigonometric polynomial operatorSn(f;r,θ) (wherer is a given natural number) based on the values off(θ) (wheref(θ)∈C2πandf(θ) is an odd function) with the nodes({θk=kπ/(n+1)}nk=1). It has been proved thatSn(f;r,θ) uniformly converges to f(θ) (f(θ)∈C2πandf(θ) is an odd function) on the total real axis. AndSn(f;r,θ) reaches the best approximation order when used to approximate tof(θ) wheref(θ)∈Cj2π (0≤j≤r-1) andf(θ) is an odd function.
【关键词】 组合型三角插值多项式;
一致收敛;
最佳收敛阶;
【Key words】 combinatorial trigonometric interpolation polynomial; uniform convergence; best convergence order;
【Key words】 combinatorial trigonometric interpolation polynomial; uniform convergence; best convergence order;
- 【文献出处】 吉林大学学报(理学版) ,Acta Scientiarium Naturalium Universitatis Jilinensis , 编辑部邮箱 ,2004年01期
- 【分类号】O174.14
- 【被引频次】9
- 【下载频次】88