English

Extension of Arakelyan's Theorem

Complex Variables 2024-05-06 v6

Abstract

Arakeljan's Theorem provides conditions on a relatively closed subset FF of a domain GCG\subset\mathbb{C}, such that any continuous function f:FCf:F\rightarrow\mathbb{C} that is analytic in FF^\circ, can be approximated by analytic functions defined on GG. In this paper we will extend Arakeljan's theorem by adding the extra requirement that the analytic functions that approximate ff may also be chosen to be bounded on a closed set CG.C\subset G. In \cite{RU} the same problem has been considered but for the specific case that G=CG=\mathbb{C}. In this paper we will extend the result in \cite{RU} and show that is true for an arbitrary GG, provided that FF and CC satisfy certain topological condition in GG. Additionally, we will show that the result holds always true when GG is simply connected.

Keywords

Cite

@article{arxiv.2304.03334,
  title  = {Extension of Arakelyan's Theorem},
  author = {Spyros Pasias},
  journal= {arXiv preprint arXiv:2304.03334},
  year   = {2024}
}
R2 v1 2026-06-28T09:53:35.379Z