English

Modulo arithmetic of function spaces: Subset hyperspaces as quotients of function spaces

General Topology 2025-11-18 v2

Abstract

Let XX be a (topological) space and Cl(X)Cl(X) the collection of nonempty closed subsets of XX. Given a topology on Cl(X)Cl(X), making Cl(X)Cl(X) a space, a (subset) hyperspace of XX is a subspace JCl(X)\mathcal{J}\subset Cl(X) with an embedding XJX\hookrightarrow\mathcal{J}, x{x}x\mapsto\{x\}. In this note, we characterize certain hyperspaces JCl(X)\mathcal{J}\subset Cl(X) as explicit quotient spaces of function spaces FXY\mathcal{F}\subset X^Y and discuss metrization of associated compact-subset hyperspaces in this setting. In particular, we find that any hyperspace topology containing the Vietoris topology is a quotient of a function space topology containing the topology of pointwise convergence.

Keywords

Cite

@article{arxiv.2503.10803,
  title  = {Modulo arithmetic of function spaces: Subset hyperspaces as quotients of function spaces},
  author = {Earnest Akofor},
  journal= {arXiv preprint arXiv:2503.10803},
  year   = {2025}
}

Comments

Accepted by Houston Journal of Mathematics

R2 v1 2026-06-28T22:19:43.124Z