Levy's phenomenon for entire functions of several variables

A. O. Kuryliak ; O. B. Skaskiv ; O. V. Zrum

Ufa mathematical journal, Tome 6 (2014) no. 2, pp. 111-120

Résumé

For entire functions $f(z)=\sum_{n=0}^{+\infty}a_nz^n$, $z\in\mathbb C$, P. Lévy (1929) established that in the classical Wiman's inequality $M_f(r)\leq\mu_f(r)(\ln\mu_f(r))^{1/2+\varepsilon}$, $\varepsilon>0$, which holds outside a set of finite logarithmic measure, the constant $1/2$ can be replaced almost surely in some sense by $1/4$; here $M_f(r)=\max\{|f(z)|\colon|z|=r\}$, $\mu_f(r)=\max\{|a_n|r^n\colon n\geq0\}$, $r>0$. In this paper we prove that the phenomenon discovered by P. Lévy holds also in the case of Wiman's inequality for entire functions of several variables, which gives an affirmative answer to the question of A. A. Goldberg and M. M. Sheremeta (1996) on the possibility of this phenomenon.

Détail

Keywords: Levy's phenomenon, random entire functions of several variables, Wiman's inequality.