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On a problem of M. A. Lavrent'ev concerning the representability of functions by series of polynomials in the complex domain
A. A. Danielyan Moscow Aviation Institute
Abstract:
M. A. Lavrent'ev has constructed an example of a compact set $E$ in $\mathbb C$ that is the boundary of a domain containing $\infty$ and such that every portion of $E$ separates the plane. Let $\{D_{n_k}\}$ and $\{D_{m_k}\}$ be two subsequences of bounded domains in the complement to $E$ such that every neighbourhood of every point of $E$ contains domains of both subsequences. Let functions $f_1(z)$ and $f_2(z)$ be defined in a disc $U$ that contains $E$. Suppose that they are regular outside $E$, coincide on all
Domains $\{D_{m_k}\}$ and are limits everywhere in $U$ of pointwise convergent sequences of polynomials. Are there always domains in $\{D_{m_k}\}$ on which $f_1$ and $f_2$ coincide identically? In this paper we give a negative answer to this question of Lavrent'ev.
Received: 02.12.1996
Citation:
A. A. Danielyan, “On a problem of M. A. Lavrent'ev concerning the representability of functions by series of polynomials in the complex domain”, Izv. Math., 63:2 (1999), 245–254
Linking options:
https://www.mathnet.ru/eng/im234https://doi.org/10.1070/im1999v063n02ABEH000234 https://www.mathnet.ru/eng/im/v63/i2/p29
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Abstract page: | 405 | Russian version PDF: | 192 | English version PDF: | 12 | References: | 47 | First page: | 1 |
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