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A multi-step Ulm-Chebyshev-like method for solving nonlinear operator equations
AIMS Mathematics 2024, 9(10): 28623-28642
Published: 15 October 2024
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In this paper, based on the Ulm-Chebyshev iterative procedure, we present a multi-step Ulm-Chebyshev-like method to solve systems of nonlinear equations F(x)=0,

{yn=xnBnF(xn),zn=ynBnF(yn),xn+1=znBnF(zn),B¯n=2BnBnAn+1Bn,Bn+1=B¯n+B¯n(2IAn+1B¯n)(IAn+1B¯n),n=0,1,2,,

where An+1 is an approximation of the derivative F(xn+1). This method does not contain inverse operators in its expression, and does not require computing Jacobian matrices for solving Jacobian equations. We have proved that the multi-step Ulm-Chebyshev-like method converges locally to the solution with R-convergence rate 4 under appropriate conditions. Some applications are given, compared with other existing methods, where the most important features of the method are shown.

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