Year: 2026
Type: preprint
Abstract: We give negative answers to Questions 4.4 and 4.5 in Cao's survey on the Wijsman topology. We construct a metrizable space $Y$ and a compatible metric $d$ such that every finite power $Y^n$ is Baire, while $(\mathrm{CL}(Y),τ_W(d))$ is not Baire. The construction realizes the Vietoris hyperspace of a suitable metric space as an open subspace of a ball hyperspace. We also study the set $S_d$ of points having an open $σ$-$d$-totally bounded neighborhood. We prove that Baireness of $(\mathrm{CL}(X),τ_W(d))$ implies Baireness of $S_d$, and that, whenever $S_d$ is dense in $X$, the following three conditions are equivalent: $(\mathrm{CL}(X),τ_W(d))$ is Baire, $X$ is Baire, and $S_d$ is Baire. As consequences, we obtain complete characterizations for locally $σ$-$d$-totally bounded metric spaces, countable metric spaces, and $σ$-compact metrizable spaces. In our counterexample, $S_e$ coincides with a non-dense discrete component for every compatible metric $e$, showing that the density assumption is essential.
Source: arXiv (Cornell University)
Author: de Ryke, Basile Beyer
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7224081919