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Nonstationary vs. stationary iterative processes

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In this paper, we define s-nonstationary iterative process and obtain its properties. We prove, that for any one-point iterative process without memory, there exists an s-nonstationary process of the same order, but of higher efficiency by the criteria of Traub and Ostrowski. We supply constructions of s-nonstationary processes for Newton’s, Halley’s, and Chebyshev’s methods, obtain their properties and, for some of them, also their geometric interpretation. The algorithms we present can be transformed into computer programs in a straightforward manner. Additionally, we illustrate numerical examples, as demonstrations for the methods we present.

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Correspondence to Luba Sapir.

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Sapir, L., Kogan, T., Sapir, A. et al. Nonstationary vs. stationary iterative processes. Numer Algor 86, 515–535 (2021).

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