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- W2052157027 abstract "Ostrowski provided the sharp sufficient condition ρ ( F ′ ( x ∗ ) ) < 1 for x ∗ to be an attraction point, for a nonlinear mapping differentiable at a fixed point x ∗ [1] . This result provides no estimate for the size of the attraction ball. Recently, Cătinaş [2] provided such an estimate in terms of ‖ F ′ ( x ∗ ) ‖ < 1 in a Hölder continuity setting. We show that the results by Cătinaş remain valid in a weaker setting by simply replacing the Hölder by the center-Hölder continuity assumption. The radius of convergence of Picard’s iteration is extended, which allows a wider choice of initial guesses. Moreover the estimates of the distances ‖ x 0 − x ∗ ‖ are more precise, which lead to the computation of fewer iterates to achieve a desired accuracy. We also provide examples where our results apply, whereas those by Cătinaş [2] do not, or where our results are better." @default.
- W2052157027 created "2016-06-24" @default.
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- W2052157027 date "2010-04-01" @default.
- W2052157027 modified "2023-10-18" @default.
- W2052157027 title "Improved results on estimating and extending the radius of an attraction ball" @default.
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- W2052157027 doi "https://doi.org/10.1016/j.aml.2009.11.007" @default.
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