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JOURNALS // Zapiski Nauchnykh Seminarov POMI // Archive

Zap. Nauchn. Sem. POMI, 1997 Volume 237, Pages 46–55 (Mi znsl427)

This article is cited in 2 papers

On the value region of $f(z_0)$ in one class of typically real functions

E. G. Goluzina

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

Abstract: Let $T_R$ be the class of functions $f(z)$ with $f(0)=0$ and $f'(0)=1$ that are regular and typically real in the disk $|z|<1$. The region of values of the system $\{f(z_0), f(r), f''(0)/2\}$ (for fixed $z_0$ and $r$, $0<r<1$) on the class $T_R$ is determined. The region of values of $f(z_0)$ on the class of functions from $T_R$ with fixed $f(r)$ and $f''(0)$ is found.

UDC: 517.54

Received: 20.09.1997


 English version:
Journal of Mathematical Sciences (New York), 1999, 95:3, 2202–2208

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