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Zapiski Nauchnykh Seminarov POMI, 2005, Volume 323, Pages 24–33
(Mi znsl377)
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This article is cited in 2 scientific papers (total in 2 papers)
On the region of values of the system $\{f(z_1),\dots,f(z_n)\}$ in the class of typically real functions. II
E. G. Goluzina St. Petersburg Department of V. A. Steklov Institute of Mathematics, Russian Academy of Sciences
Abstract:
The paper studies the region $D_{m,1}(T)$ of values of the system $\{f(z_1),f(z_2),\dots,f(z_m),f(r)\}$, $m\ge1$, where $z_j$ ($j=1,2,\dots,m$) are arbitrary fixed points of the disk $U=\{z:|z|<1\}$ with $\operatorname{Im}z_j\ne0$ ($j=1,2,\ldots,m$), and $r$, $0<r<1$, is fixed, on the class $T$ of functions $f(z)=z+a_2z^2+\cdots$ regular in the disk $U$ and satisfying in the latter the condition $\operatorname{Im}f(z)\operatorname{Im}z>0$ for $\operatorname{Im}z\ne0$. An algebraic characterization of the set $D_{m,1}(T)$ in terms of nonnegative Hermitian forms is given, and all the boundary functions are described. As an implication, the region of values of $f(z_m)$ in the subclass of functions from the class $T$ with prescribed values $f(z_k)$ ($k=1,2,\dots,m-1$) and $f(r)$ is determined.
Received: 13.06.2005
Citation:
E. G. Goluzina, “On the region of values of the system $\{f(z_1),\dots,f(z_n)\}$ in the class of typically real functions. II”, Computational methods and algorithms. Part XVIII, Zap. Nauchn. Sem. POMI, 323, POMI, St. Petersburg, 2005, 24–33; J. Math. Sci. (N. Y.), 137:3 (2006), 4774–4779
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https://www.mathnet.ru/eng/znsl377 https://www.mathnet.ru/eng/znsl/v323/p24
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Abstract page: | 313 | Full-text PDF : | 60 | References: | 67 |
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