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Itogi Nauki i Tekhniki. Sovremennaya Matematika i ee Prilozheniya. Tematicheskie Obzory, 2017, Volume 143, Pages 48–62
(Mi into262)
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This article is cited in 1 scientific paper (total in 1 paper)
Set of exponents for interpolation of exponential series by sums in all convex domains
S. G. Merzlyakov, S. V. Popenov Institution of Russian Academy of Sciences Institute of Mathematics with Computer Center, Ufa
Abstract:
We study the problem of multiple finite-sum interpolation in all convex domains of the complex plane of absolutely converging exponential series with exponents from a given set $\Lambda$. We obtain the following solvability criterion for this problem: each direction at infinity must be a limit direction for the set $\Lambda$. We prove that this problem is equivalent to certain particular problems of simple interpolation and to pointwise approximation of exponential series by sums in some specific domains. The same description is also obtained for problems of simple interpolation and pointwise approximation in all convex domains by functions that belong to subspaces invariant with respect to the
differentiation operator and admit spectral synthesis in spaces of holomorphic functions on these domains.
Keywords:
convex domain, interpolation, exponential series, invariant subspace, exponent, limit direction, duality.
Citation:
S. G. Merzlyakov, S. V. Popenov, “Set of exponents for interpolation of exponential series by sums in all convex domains”, Differential equations. Mathematical analysis, Itogi Nauki i Tekhniki. Sovrem. Mat. Pril. Temat. Obz., 143, VINITI, M., 2017, 48–62; Journal of Mathematical Sciences, 245:1 (2020), 48–63
Linking options:
https://www.mathnet.ru/eng/into262 https://www.mathnet.ru/eng/into/v143/p48
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Abstract page: | 232 | Full-text PDF : | 52 | First page: | 12 |
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