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- W2028196913 abstract "Abstract NECESSARY and sufficient conditions are obtained for the approximation of an extremal problem with respect to a functional, and their application to the investigation of the convergence of some methods for solving constrained extremal problems is described. Aspects of the regularization of incorrectly posed extremal problems are discussed. In the present paper, to be published in two parts, we discuss the construction of a sequence of extremal problems, approximating an initial extremal problem both in the sense of the optimal value of a functional, and in the sense of the set of elements realizing this value, together with the related question of the stability of extremal problems. In Part I, necessary and sufficient conditions are found for the approximation of the initial problem “with respect to a functional” (Section 1). The results obtained are then applied to the investigation of some constrained minimization methods. In particular, Section 2 deals with the Ritz method, and Section 3 with finite-difference approximations for optimal control problems. Taking A. N. Tikhonov's regularization method [1, 2] as starting-point, Section 4 discusses the construction of elements close to the set on which the optimal value of the functional is realized in the initial problem." @default.
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- W2028196913 date "1971-01-01" @default.
- W2028196913 modified "2023-09-26" @default.
- W2028196913 title "On the approximation of extremal problems. I" @default.
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- W2028196913 doi "https://doi.org/10.1016/0041-5553(71)90129-7" @default.
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