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This article is cited in 8 scientific papers (total in 8 papers)
An analogue of the two-constants theorem and optimal recovery of analytic functions
R. R. Akopyanab a Ural Federal University named after the first President of Russia
B.N. Yeltsin, Ekaterinburg, Russia
b N.N. Krasovskii Institute of Mathematics and Mechanics of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia
Abstract:
Several related extremal problems for analytic functions in a simply connected domain $G$ with rectifiable Jordan boundary $\Gamma$ are treated. The sharp inequality
$$
|f(z)|\le\mathscr C^{r,q}(z;\gamma_0,\varphi_0;\gamma_1,\varphi_1)\|f\|^\alpha_{L^q_{\varphi_1}(\gamma_1)}\|f\|^{1-\alpha}_{L^r_{\varphi_0}(\gamma_0)}
$$
is established between a value of an analytic function in the domain and the weighted integral norms of the restrictions of its boundary values to two measurable subsets $\gamma_1$ and $\gamma_0=\Gamma\setminus\gamma_1$ of the boundary of the domain. It is an analogue of the F. and R. Nevanlinna two-constants theorem. The corresponding problems of optimal recovery of a function from its approximate boundary values on $\gamma_1$ and of the best approximation to the functional of analytic extension of a function from the part of the boundary $\gamma_1$ into the domain are solved.
Bibliography: 35 titles.
Keywords:
analytic functions, F. and R. Nevanlinna two-constants theorem, optimal recovery of a functional, best approximation of an unbounded functional by bounded functionals, harmonic measure.
Received: 02.04.2017 and 24.05.2019
Citation:
R. R. Akopyan, “An analogue of the two-constants theorem and optimal recovery of analytic functions”, Mat. Sb., 210:10 (2019), 3–16; Sb. Math., 210:10 (2019), 1348–1360
Linking options:
https://www.mathnet.ru/eng/sm8952https://doi.org/10.1070/SM8952 https://www.mathnet.ru/eng/sm/v210/i10/p3
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Abstract page: | 574 | Russian version PDF: | 52 | English version PDF: | 38 | References: | 54 | First page: | 18 |
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