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 Mat. Zametki, 2005, Volume 77, Issue 1, Pages 3–15 (Mi mz2464)

Szegő theorem, Carathéodory domains, and boundedness of calculating functionals

F. G. Abdullaeva, A. A. Dovgosheyb

a University of Mersin
b Institute of Applied Mathematics and Mechanics, Ukraine National Academy of Sciences

Abstract: Suppose that $G$ is a bounded simply connected domain on the plane with boundary $\Gamma$, $z_0\in G$, $\omega$ is the harmonic measure with respect to $z_0$, on $\Gamma$, $\mu$ is a finite Borel measure with support $\operatorname{supp}(\mu)\subseteq\Gamma$, $\mu_a+\mu_s$ is the decomposition of $\mu$ with respect to $\omega$, and $t$ is a positive real number. We solve the following problem: for what geometry of the domain $G$ is the condition
$$\int\ln(\frac{d\mu_a}{d\omega}) d\omega=-\infty$$
equivalent to the completeness of the polynomials in$L^t(\mu)$ or to the unboundedness of the calculating functional $p\to p(z_0)$, where $p$ is a polynomial in $L^t(\mu)$? We study the relationship between the densities of the algebras of rational functions in $L^t(\mu)$ and $C(\Gamma)$. For $t=2$, we obtain a sufficient criterion for the unboundedness of the calculating functional in the case of finite Borel measures with support of an arbitrary geometry.

DOI: https://doi.org/10.4213/mzm2464

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English version:
Mathematical Notes, 2005, 77:1, 3–14

Bibliographic databases:

UDC: 517.53

Citation: F. G. Abdullaev, A. A. Dovgoshey, “Szegő theorem, Carathéodory domains, and boundedness of calculating functionals”, Mat. Zametki, 77:1 (2005), 3–15; Math. Notes, 77:1 (2005), 3–14

Citation in format AMSBIB
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