English

More on Halfway New Cardinal Characteristics

Logic 2025-09-19 v2

Abstract

We continue investigating variants of the splitting and reaping numbers introduced in arXiv:1808.02442. In particular, answering a question raised there, we prove the consistency of cof(M)<s12\mathrm{cof}(\mathcal{M})<\mathfrak{s}_{\frac{1}{2}} and of r12<add(M)\mathfrak{r}_{\frac{1}{2}}<\mathrm{add}(\mathcal{M}). Moreover, we discuss their natural generalisations sρ\mathfrak{s}_\rho and rρ\mathfrak{r}_\rho for ρ(0,1)\rho\in (0,1), and show that rρ\mathfrak{r}_\rho does not depend on ρ\rho.

Cite

@article{arxiv.2304.09698,
  title  = {More on Halfway New Cardinal Characteristics},
  author = {Barnabás Farkas and Lukas Daniel Klausner and Marc Lischka},
  journal= {arXiv preprint arXiv:2304.09698},
  year   = {2025}
}

Comments

14 pages, 2 figures

R2 v1 2026-06-28T10:11:06.574Z