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On the Behavior of Power Series with Completely Additive Coefficients

Volume 63 / 2015

Oleg Petrushov Bulletin Polish Acad. Sci. Math. 63 (2015), 217-225 MSC: Primary 11N37; Secondary 30B30. DOI: 10.4064/ba8018-1-2016 Published online: 18 January 2016


Consider the power series $\mathfrak {A}(z)= \sum _{n=1}^{\infty }\alpha (n)z^n$, where $\alpha (n)$ is a completely additive function satisfying the condition $\alpha (p)=o(\operatorname {ln}p)$ for prime numbers $p$. Denote by $e(l/q)$ the root of unity $e^{2\pi il/q}$. We give effective omega-estimates for $\mathfrak {A}(e(l/p^k)r)$ when $r\to 1-$. From them we deduce that if such a series has non-singular points on the unit circle, then it is a zero function.


  • Oleg PetrushovMoscow State University
    Moscow, Russia

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