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Journal of Computational and Applied Mathematics
Volume 157, Issue 1, 1 August 2003, Pages 169-185
 
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doi:10.1016/S0377-0427(03)00390-X    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2003 Elsevier B.V. All rights reserved.

An improved error analysis for Newton-like methods under generalized conditions

Ioannis K. ArgyrosCorresponding Author Contact Information, E-mail The Corresponding Author

Department of Mathematical Sciences, Cameron University, Lawton, OK 73505-6377, USA

Received 19 August 2002; 
revised 25 December 2002. 
Available online 4 June 2003.

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Abstract

We introduce new semilocal convergence theorems for Newton-like methods in a Banach space setting. Using new and very general conditions we provide different sufficient convergence conditions than before. This way we introduce more precise majorizing sequences, which in turn lead to finer error estimates and a better information on the location of the solution. Moreover for special choices of majorizing functions our results reduce to earlier ones. In the local case we obtain a larger convergence radius (ball). Finally, as an application, we show that in the case of Newton's method the famous Newton–Kantorovich hypothesis can be weakened under the same information.

Author Keywords: Newton-like method; Banach space; Majorant principle; Newton–Kantorovich hypothesis; Fréchet-derivative; Majorizing sequence; Radius of convergence

Mathematical subject codes: 65B05; 65G99; 65J15;47H17; 49M15; CR:1.5

Article Outline

1. Introduction
2. Semilocal analysis for Newton-like methods
3. Local convergence of Newton-like methods
References

 
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