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arXiv 0909.0684math.CA
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迭代伯恩斯坦多项式逼近

Iterated Bernstein polynomial approximations

Zhong Guan

摘要:

连续函数的n次迭代伯恩斯坦多项式逼近,它也使用函数在i/n处的值,i= 0,1,.,n,提出。经典的伯恩斯坦多项式逼近的收敛速率被迭代的伯恩斯坦多项式逼近显着提高,而不增加多项式的次数。得到了n次极限迭代伯恩斯坦多项式逼近在迭代次数趋于无穷大时的封闭形式。同样的思想也适用于q-伯恩斯坦多项式和Szasz-Mirakyan近似。数值积分近似的应用进行了讨论。

英文摘要:

Iterated Bernstein polynomial approximations of degree n for continuous function which also use the values of the function at i/n, i=0,1,...,n, are proposed. The rate of convergence of the classic Bernstein polynomial approximations is significantly improved by the iterated Bernstein polynomial approximations without increasing the degree of the polynomials. The close form expression of the limiting iterated Bernstein polynomial approximation of degree n when the number of the iterations approaches infinity is obtained. The same idea applies to the q-Bernstein polynomials and the Szasz-Mirakyan approximation. The application to numerical integral approximations is also discussed.

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