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The Laguerre-and-sums-of-powers algorithm for the efficient and reliable approximation of all polynomial roots. (English. Russian original) Zbl 1351.65027
Probl. Inf. Transm. 51, No. 4, 361-370 (2015); translation from Probl. Peredachi Inf. 51, No. 4, 60-70 (2015).
Summary: We prove the first sufficient convergence criterion for Laguerre’s root-finding algorithm, which by empirical evidence is highly efficient. The criterion is applicable to simple roots of polynomials with degree greater than 3. The “sums of powers algorithm” (SPA), which is a reliable iterative root-finding method, can be used to fulfill the condition for each root. Therefore, Laguerre’s method together with the SPA is now an efficient and reliable algorithm (LaSPA). In computational mathematics these results solve a central task which was first attacked by L. Euler 266 years ago.
65H04 Numerical computation of roots of polynomial equations
Full Text: DOI
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