On a third order iterative method for solving polynomial operator equations
Keywords:two-step Newton method, Chebyshev method, eigenpair problems
AbstractWe present a semilocal convergence result for a Newton-type method applied to a polynomial operator equation of degree \(2\). The method consists in fact in evaluating the Jacobian at every two steps, and it has the \(r\)-convergence order at least \(3\). We apply the method in order to approximate the eigenpairs of matrices. We perform some numerical examples on some test matrices and compare the method with the Chebyshev method. The norming function we have proposed in a previous paper shows a better convergence of the iterates than the classical norming function for both the methods.
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