Abstract
We develop three third order derivative-free iterative methods to solve the nonlinear ill-posed oprerator equation \(F(x)=f\) approximately. The methods involve two steps and are free of derivatives. Convergence analysis shows that these methods converge cubically. The adaptive scheme introduced in Pereverzyev and Schock (SIAM J Numer Anal 43(5):2060–2076, 2005) has been employed to choose regularization parameter. These methods are applied to the inverse gravimetry problem to validate our developed results.
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Acknowledgements
Ms Shubha VS would like to thank NBHM, Government of India, for providing fellowship under the Post-Doctral fellowship scheme, to carry out the research activities in the department of Mathematical and Computational Sciences, National Institute of Technology Karnataka, Surathkal, India. The work of Santhosh George and Jidesh P is supported by the Science and Engineering Research Board Government of India under the Grant No: EMR2017001597.
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Shubha, V.S., George, S. & Jidesh, P. Third-order derivative-free methods in Banach spaces for nonlinear ill-posed equations. J. Appl. Math. Comput. 61, 137–153 (2019). https://doi.org/10.1007/s12190-019-01246-1
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DOI: https://doi.org/10.1007/s12190-019-01246-1
Keywords
- Iterative methods
- Cubic convegence
- Nonlinear ill-posed equation
- Derivative free method
- Lavrentiev regularization method
- Adaptive method