廣義方程若干算法的收斂性分析
[Abstract]:In this paper, the problem of solving generalized equations is studied. For non-smooth generalized equations, a precise and imprecise non-smooth algorithm is proposed. Under certain assumptions, the convergence of the algorithm is analyzed. In this paper, a generalized Gao Si-Newton iterative method is proposed for smooth underdefined generalized equations, and its convergence is analyzed. The main contents are divided into two chapters. In the second chapter, combined with the generalized Newton iterative method in [64] and the generalized Jacobian-based Newton iterative method in [50], the exact and imprecise algorithms for solving non-smooth generalized equations are proposed. These algorithms are obtained by using generalized Jacobian matrix instead of Frechet derivative. Under the condition that the function is semi-smooth, we give different hypotheses for the two algorithms, and prove that the semi-local convergence of the algorithm includes linear convergence, superlinear convergence, square convergence and l p-order convergence. Furthermore, while proving the local convergence result of the algorithm, the existence and uniqueness of the solution are given. Finally, the exact method is applied to variational inequality problem, and a concrete example is given to carry on the numerical experiment. The numerical results show the feasibility and convergence of the exact algorithm. In chapter 3, we consider an underdefined generalized equation where the matrix corresponding to the Frechet derivative of a function is a row full rank. In this case, the generalized Newton iteration method can not get the unique iteration point, so we consider the generalized Gao Si-Newton iteration method, that is, to find the minimum norm solution in each iteration process. For large-scale problems, the exact algorithm is difficult to solve the minimum norm solution, so we only consider the case where the matrix corresponding to the Frechet derivative of the function is a row-full rank. Because the function is smooth and we study it in the finite dimensional space, this ensures the existence of the minimum solution of the norm of the generalized equation in the iterative process, and also shows that our algorithm is well-defined. Under the condition that the Frechet derivative satisfies the classical Lipschitz condition, the Kantorovich type theorem is obtained and the local convergence result is obtained by combining the technique of the optimal function. Furthermore, the semi-local convergence and local convergence of the algorithm are proved when the function condition is weakened to satisfy the L-means Lipschitz condition. Finally, as an application, we apply the results to some special cases, such as: the Kantorovich type criterion is obtained when the function satisfies the classical Lipschitz condition; the convergence result of the function satisfies the 緯-condition and the Smale point estimation theorem of the function under the analytic condition.
【學位授予單位】:浙江大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:O241.6
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