Polynomial root-finding algorithms and branched covers

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Myong-Hi Kim, Scott Sutherland

We construct a family of root-finding algorithms which exploit the branched covering structure of a polynomial of degree d with a path-lifting algorithm for finding individual roots. In particular, the family includes an algorithm that computes an ϵ-factorization of the polynomial which has an arithmetic complexity of $\Order{d^2(\log d)^2 + d(\log d)^2|\log\epsilon|}$. At the present time (1993), this complexity is the best known in terms of the degree.


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