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On the convergence of the classical Jacobi method for real symmetric matrices with non-distinct eigenvalues
Pages 11–18https://doi.org/10.1007/BF02165224
It is proved that the classical Jacobi method for real symmetric matrices with multiple eigenvalues converges quadratically.
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Convergence of the newton process to multiple solutions
Pages 23–37https://doi.org/10.1007/BF02165226
In 1870, E.Schröder showed that the convergence of the Newton process of successive approximations to a multiple solution of a scalar equation was geometric in character, and that quadratic convergence could be restored by multiplying the ordinary ...