On the speed of convergence of Newton's method for complex polynomials
On the speed of convergence of Newton's method for complex polynomials
复制标题
论复数多项式牛顿法的收敛速度
DOI:
10.1090/mcom/2985
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
Dierk Schleicher
中科院分区:
文献类型:
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作者:
Todor Bilarev;Magnus Aspenberg;Dierk Schleicher
We investigate Newton’s method for complex polynomials of arbitrary degree, normalized so that all their roots are in the unit disk. For each degree, we give an explicit setofpoints with the following universal property: for every normalized polynomial of degreethere arestarting points inwhose Newton iterations find all the roots with a low number of iterations: if the roots are uniformly and independently distributed, we show that with probability at leastthe number of iterations for thesestarting points to reach all roots with precisionis. This is an improvement of an earlier result by Schleicher, where the number of iterations is shown to bein the worst case (allowing multiple roots) andfor well-separated (so-called-separated) roots.
DOI:
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发表时间:
1982
期刊:
影响因子:
--
作者:
M. Lyubich
通讯作者:
M. Lyubich