Zhou, Wei-Jun; Li, Dong-Hui A globally convergent BFGS method for nonlinear monotone equations without any merit functions. (English) Zbl 1203.90180 Math. Comput. 77, No. 264, 2231-2240 (2008). Summary: Since 1965, there has been significant progress in the theoretical study on quasi-Newton methods for solving nonlinear equations, especially in the local convergence analysis. However, the study on global convergence of quasi-Newton methods is relatively fewer, especially for the BFGS method. To ensure global convergence, some merit function such as the squared norm merit function is typically used. We propose an algorithm for solving nonlinear monotone equations, which combines the BFGS method and the hyperplane projection method. We also prove that the proposed BFGS method converges globally if the equation is monotone and Lipschitz continuous without differentiability requirement on the equation, which makes it possible to solve some nonsmooth equations. An attractive property of the proposed method is that its global convergence is independent of any merit function.We also report some numerical results to show efficiency of the proposed method. Cited in 56 Documents MSC: 90C53 Methods of quasi-Newton type Keywords:BFGS method; monotone equation; hyperplane projection method; global convergence Software:L-BFGS PDF BibTeX XML Cite \textit{W.-J. Zhou} and \textit{D.-H. Li}, Math. Comput. 77, No. 264, 2231--2240 (2008; Zbl 1203.90180) Full Text: DOI References: [1] C. G. Broyden, A class of methods for solving nonlinear simultaneous equations, Math. Comp. 19 (1965), 577 – 593. · Zbl 0131.13905 [2] C. G. Broyden, J. E. Dennis Jr., and Jorge J. Moré, On the local and superlinear convergence of quasi-Newton methods, J. Inst. Math. Appl. 12 (1973), 223 – 245. · Zbl 0282.65041 [3] Richard H. Byrd and Jorge Nocedal, A tool for the analysis of quasi-Newton methods with application to unconstrained minimization, SIAM J. Numer. 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