On the slow growth of power series convergent in the unit disk

Author
P. V. Filevych
Abstract
We construct two power series $f(z)=\sum_{n=0}^\infty a_nz^n$ convergent in the unit disk with the maximum modulus $M_f(r)=\max\{|f(z)|:|z|=r\}$ and the maximum term $\mu_f(r)=\max\{|a_n|r^n:n\ge 0\}$ such that
1) $a_n\not= O(1)$ $(n\to\infty)$, $\ln\mu_f(r)$ is a slowly growing function and $\ln M_f(r)$ is not slowly growing;
2) $a_n= O(1)$ $(n\to\infty)$, and $\ln M_f(r)$ is not a slowly growing function are constructed.
Keywords
power series in the unit disk, maximum modulus, maximum term, slowly growing functions, growth of analytic functions, coefficients of power series, complex analysis, asymptotic growth of functions
DOI
doi:10.30970/ms.16.2.217-221
Reference
1. Sheremeta M.M., Zabolotskyi M.V. Slow growth of power series convergent in the unit disk, Mat. Studii, 11 (1999), no. 2, 221–224.

Pages
217-221
Volume
16
Issue
2
Year
2001
Journal
Matematychni Studii
Full text of paper
pdf
Table of content of issue