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JOURNALS // Zapiski Nauchnykh Seminarov POMI // Archive

Zap. Nauchn. Sem. POMI, 2009 Volume 371, Pages 7–17 (Mi znsl3541)

This article is cited in 2 papers

On the region of values of the system $\{c_2,f(z_1),f(z_2)\}$ in the class of typically real finctions

E. G. Goluzina

St. Petersburg Department of V. A. Steklov Institute of Mathematics, Russian Academy of Sciences, St. Petersburg, Russia

Abstract: The author's investigations in the well known class $T$ of typically real functions $f(z)$ in the disk $U=\{z\colon|z|<1\}$ are prolonged. The region of values of the system $\{c_2,f(z_1),f(z_2)\}$ in the class $T$ is investigated. As a corollary, the region of values $f(z_2)$ in the class of functions $f\in T$ with fixed values $c_2$ and $f(z_1)$ is determined. In the proof a criterion of decision power moment problem is used. Bibl. – 8 titles.

Key words and phrases: typically real function, coefficient problems, region of values.

UDC: 517.54

Received: 12.10.2009


 English version:
Journal of Mathematical Sciences (New York), 2010, 166:2, 128–133

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