Year: 2026
Type: preprint
Abstract: Let $\mathcal{N}^h_Ω$ be the null ideal of the Hausdorff measure constructed by Davies and Rogers. We give a Tukey reduction of $(\mathcal{N}^h_Ω,\mathcal{N}^h_Ω,\subseteq)$ to a localization system with finite coordinate sets. It follows that $\mathfrak{v}^\forall_{D,g}\le\operatorname{add}(\mathcal{N}^h_Ω)$ and $\operatorname{cof}(\mathcal{N}^h_Ω)\le\mathfrak{c}^\forall_{D,g}$ for some $D, g \in ω^ω$. Consequently, we prove the consistency of $\mathfrak{d}<\operatorname{add}(\mathcal{N}^h_Ω)$ and, separately, $\operatorname{cof}(\mathcal{N}^h_Ω)<\mathfrak{b}$. Hence the additivity and cofinality of $\mathcal{N}^h_Ω$ can differ from those of the Lebesgue null ideal. We also show that the finite graphs in the Davies--Rogers construction can be chosen so that $\operatorname{cov}(\mathcal{N}^h_Ω)\le\operatorname{non}(\mathcal{N}^h_Ω)$.
Source: arXiv (Cornell University)
Author: Goto, Tatsuya
Institution: TU Wien
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7220953777