English

Cascading Variants of Internal Approachability

Logic 2024-04-30 v1

Abstract

We construct models in which there are stationarily many structures that exhibit different variants of internal approachability at different levels. This answers a question of Foreman. We also show that the approachability property at μ\mu is consistent with having a distinction of variants of internal approachability for stationarily many N[H(μ+)]μN\in[H(\mu^+)]^{\mu}. This is obtained using a new version of Mitchell Forcing.

Keywords

Cite

@article{arxiv.2404.18571,
  title  = {Cascading Variants of Internal Approachability},
  author = {Hannes Jakob},
  journal= {arXiv preprint arXiv:2404.18571},
  year   = {2024}
}

Comments

12 pages, 0 figures

R2 v1 2026-06-28T16:09:32.583Z