摘要
对基于节点组(1,4)的修改的(0;1;2)插值多项式Qn(f,x)的收敛性,本文改进了Akhlaghi的结果,也即对于[-1,1]上的r(≥2)次连续可微函数f(x),当n≥4/3(r+2)时,成立|f(x)-Qn(f,x)|=O(1)n<sup>2-r</sup>ω(f<sup>r</sup>,1/n),x∈[-1,1]
For convergence of the modified (0;1;2) interpolation Q<sub>n</sub>(f,x) on the set of nodes(1,4), we obtain an essential improvement of the Akhlaghi’s theorem.That is for r-times continuously differentiable function f(x) on[-1,1],when r≥2 and n≥4/3(r+2) we have|f(x)-Q<sub>n</sub>(f,x)|O(1)n<sup>2-r</sup>ω(f<sup>r</sup>,1/n),x∈[-1,1]
作者
郁定国
Yu Dingguo(Department of Mathematics)