首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Bernstein-Type Theorems and Uniqueness Theorems
Authors:V Logvinenko  N Nazarova
Institution:(1) Pasadena City College, Pasadena, USA;(2) Kharkov Polytechnic University, Kharkov
Abstract:Let 
$$f$$
be an entire function of finite type with respect to finite order 
$$\rho {\text{ in }}\mathbb{C}^n $$
and let 
$$\mathbb{E}$$
be a subset of an open cone in a certain n-dimensional subspace 
$$\mathbb{R}^{2n} {\text{  ( = }}\mathbb{C}^n {\text{)}}$$
(the smaller 
$$\rho $$
, the sparser 
$$\mathbb{E}$$
). We assume that this cone contains a ray 
$$\left\{ {z = tz^0  \in \mathbb{C}^n :t > 0} \right\}$$
. It is shown that the radial indicator 
$$h_f (z^0 )$$
of 
$$f$$
at any point 
$$z^0  \in \mathbb{C}^n \backslash \{ 0\} $$
may be evaluated in terms of function values at points of the discrete subset 
$$\mathbb{E}$$
. Moreover, if 
$$f$$
tends to zero fast enough as 
$$z \to \infty $$
over 
$$\mathbb{E}$$
, then this function vanishes identically. To prove these results, a special approximation technique is developed. In the last part of the paper, it is proved that, under certain conditions on 
$$\rho $$
and 
$$\mathbb{E}$$
, which are close to exact conditions, the function 
$$f$$
bounded on 
$$\mathbb{E}$$
is bounded on the ray.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号