English

The restriction from below of the subharmonic function by the logarithm of the module of entire function

Complex Variables 2022-03-24 v1

Abstract

Let u≢u\not\equiv -\infty be a subharmonic function on the complex plane C\mathbb C. Then for any function r ⁣:C(0,1]r\colon\mathbb C\to (0,1] satisfying the condition infzClnr(z)ln(2+z)>,\inf_{z\in\mathbb C}\frac{\ln r(z)}{\ln(2+|z|)}>-\infty, there is an entire function f≢0f\not\equiv 0 such that lnf(z)12π02πu(z+r(z)eiθ)dθfor all zC. \ln |f(z)|\leq \frac{1}{2\pi}\int_0^{2\pi}u(z+r(z)e^{i\theta})\,{\mathrm d}\theta\quad\text{for all $z\in\mathbb C$.} A similar result is established for subharmonic functions of finite order with inequalities of the form lnf(z)u(z)\ln|f(z)|\leq u(z) at all points zCEz\in\mathbb C\setminus E, where the exceptional set EE is small in terms of dd-dimensional Hausdorff content of EE with variable radius rr.

Keywords

Cite

@article{arxiv.2203.12383,
  title  = {The restriction from below of the subharmonic function by the logarithm of the module of entire function},
  author = {B. N. Khabibullin},
  journal= {arXiv preprint arXiv:2203.12383},
  year   = {2022}
}

Comments

11 pages, in Russian