English

Construction of functions with given cluster sets

General Topology 2016-02-24 v1

Abstract

In this paper we continue our research of functions on the boundary of their domain and obtain some results on cluster sets of functions between topological spaces. In particular, we prove that for a metrizable topological space XX, a dense subspace YY of a metrizable compact space Y\overline{Y}, a closed nowhere dense subset LL of XX, an upper continuous compact-valued multifunction Φ:LY{\Phi:L\multimap \overline{Y}} and a set DXLD\subseteq X\setminus L such that LDL\subseteq \overline{D}, there exists a function f:DYf:D\to Y such that the cluster set f(x)\overline{f} (x) is equal to Φ(x)\Phi (x) for any xLx\in L.

Keywords

Cite

@article{arxiv.1602.07118,
  title  = {Construction of functions with given cluster sets},
  author = {O. Maslyuchenko and D. Onypa},
  journal= {arXiv preprint arXiv:1602.07118},
  year   = {2016}
}
R2 v1 2026-06-22T12:55:51.873Z