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JOURNALS // Zapiski Nauchnykh Seminarov POMI // Archive

Zap. Nauchn. Sem. POMI, 1998 Volume 254, Pages 65–75 (Mi znsl891)

This article is cited in 6 papers

On the value regions of systems $\{f(z_1),f'(z_1)\}$ and $\{f(z_1),f(z_2)\}$ in the class of typically real functions

E. G. Goluzina

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

Abstract: In the class $T$ consisting of regular and typically real functions in the disk $|x|<1$, the value regions of the system $\{f(z_1),f'(z_1)\}$ and $\{f(z_1),f(z_2)\}$ are found for fixed $z_1$ and $z_2$. As an application, the value regions of $f'(z_1)$ and $f(z_2)$ are found for $f\in T$ with fixed value $f(z_1)$.

UDC: 517.54

Received: 05.11.1998


 English version:
Journal of Mathematical Sciences (New York), 2001, 105:4, 2156–2164

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