Summary
LetΦ: ℂn→ℂn be Fréchet differentiable, and let the equation
have at least one fixed point. We considerk-step stationary iterative methods
withμ 0+μ 1+...+μ k =1. Using results for an affine mappingΦ: ℂn→ℂn, it is proven that (2) may converge locally even in cases where the usual iterationx m =Φ(x m−1) belonging to (1) diverges. These results are extended to nonstationary methods of type (2) and to “cyclic” mappings.
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Research supported by the Air Force Office of Scientific Research and by the Alexander von Humboldt-Stiftung
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Gutknecht, M.H., Niethammer, W. & Varga, R.S. k-Step iterative methods for solving nonlinear systems of equations. Numer. Math. 48, 699–712 (1986). https://doi.org/10.1007/BF01399689
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DOI: https://doi.org/10.1007/BF01399689