A small probabilistic universal set of starting points for finding roots of complex polynomials by Newton's method

preprint2011arXivOpen access

Abstract

We specify a small set, consisting of O(d(log⁡log⁡d)2)O(d(\log\log d)^2) points, that intersects the basins under Newton's method of \emph{all} roots of \emph{all} (suitably normalized) complex polynomials of fixed degrees dd, with arbitrarily high probability. This set is an efficient and universal \emph{probabilistic} set of starting points to find all roots of polynomials of degree dd using Newton's method; the best known \emph{deterministic} set of starting points consists of ⌈1.1d(log⁡d)2⌉\lceil 1.1d(\log d)^2\rceil points.

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