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Matematicheskie Zametki, 1978, Volume 23, Issue 4, Pages 593–600 (Mi mzm8175)  

Series of univalent functions

B. N. Rakhmanov

Saratov State University
Abstract: We are considering a class $S$ of functions $F(z)$, $F(0)=0$, $F'(0)=1$ that are univalent and regular in the circle $|z|=1$, and its subclasses $S_h^*$ and $K$ of starlike functions of order $h$ and of convex functions respectively. Among others, we establish the following results:
If $F(z)\in S$ and $0<\alpha<1$, then
$$ \biggl|\frac{\alpha zF''(\alpha z)}{F'(\alpha z)}-\frac{zF''(z)}{F'(z)}+\frac2{1-r^2}-\frac2{1-\alpha^2r^2}\biggr|\le\frac{4r}{1-r^2}-\frac{4\alpha r}{1-\alpha^2r^2},\quad|z|=r $$

If $F(z)\in S$ ($0<\alpha<1$) and
$$ 1+\operatorname{Re}z_1F''(z_1)/F'(z_1)=\operatorname{Re}\alpha z_1F''(\alpha z_1)/F'(\alpha z_1)\quad(2-\sqrt3<|z_1|=r<1), $$
then we obtain the domain of values of the point $\alpha z_1$.
Received: 29.09.1975
English version:
Mathematical Notes, 1978, Volume 23, Issue 4, Pages 324–328
DOI: https://doi.org/10.1007/BF01786964
Bibliographic databases:
UDC: 517.5
Language: Russian
Citation: B. N. Rakhmanov, “Series of univalent functions”, Mat. Zametki, 23:4 (1978), 593–600; Math. Notes, 23:4 (1978), 324–328
Citation in format AMSBIB
\Bibitem{Rak78}
\by B.~N.~Rakhmanov
\paper Series of univalent functions
\jour Mat. Zametki
\yr 1978
\vol 23
\issue 4
\pages 593--600
\mathnet{http://mi.mathnet.ru/mzm8175}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=492207}
\zmath{https://zbmath.org/?q=an:0414.30011|0382.30009}
\transl
\jour Math. Notes
\yr 1978
\vol 23
\issue 4
\pages 324--328
\crossref{https://doi.org/10.1007/BF01786964}
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