English

Large cardinal ideals

Logic 2021-02-22 v1

Abstract

Building on work of Holy, L\"ucke and Njegomir \cite{MR3913154} on small embedding characterizations of large cardinals, we use some classical results of Baumgartner (see \cite{MR0384553} and \cite{MR0540770}), to give characterizations of several well-known large cardinal ideals, including the Ramsey ideal, in terms of generic elementary embeddings; we also point out some seemingly inherent differences between small embedding and generic embedding characterizations of subtle cardinals. Additionally, we present a simple and uniform proof which shows that, when κ\kappa is weakly compact, many large cardinal ideals on κ\kappa are nowhere κ\kappa-saturated. Lastly, we survey some recent consistency results concerning the weakly compact ideal as well as some recent results on the subtle, ineffable and Π11\Pi^1_1-indescribable ideals on PκλP_\kappa\lambda, and we close with a list of open questions.

Cite

@article{arxiv.2102.09591,
  title  = {Large cardinal ideals},
  author = {Brent Cody},
  journal= {arXiv preprint arXiv:2102.09591},
  year   = {2021}
}

Comments

Chapter for Research Trends in Contemporary Logic

R2 v1 2026-06-23T23:18:18.765Z