RUS  ENG
Full version
JOURNALS // Zapiski Nauchnykh Seminarov POMI // Archive

Zap. Nauchn. Sem. POMI, 2000 Volume 263, Pages 40–48 (Mi znsl1134)

This article is cited in 2 papers

On the value region of initial coefficients 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 $T$ be the class of functions satisfying the following conditions: these functions are regular and typically real in the unit disk, they have the form $f(z)=z+c_2z^2+c_3z^3+\dotsc$, and the equality $f(z_1)=w_1$ holds for some fixed $z_1$ and $w_1$ with $\operatorname{Im}z_1\ne0$. We find the set of values of the first two coefficients for functions from this class. Boundary functions for these sets of values are found. Some previous results of the author are supplemented. Boundary functions for the sets of values for the functionals $f'(z_1)$ and $f(z_2)$ in the class $T_1$ are found.

UDC: 517.54

Received: 18.10.1999


 English version:
Journal of Mathematical Sciences (New York), 2002, 110:6, 3052–3057

Bibliographic databases:


© Steklov Math. Inst. of RAS, 2024