English

Ramsey-like cardinals II

Logic 2011-04-25 v1

Abstract

This paper continues the study of the Ramsey-like large cardinals. Ramsey-like cardinals are defined by generalizing the characterization of Ramsey cardinals via the existence of elementary embeddings. Ultrafilters derived from such embeddings are fully iterable and so it is natural to ask about large cardinal notions asserting the existence of ultrafilters allowing only α\alpha-many iterations for some countable ordinal α\alpha. Here we study such α\alpha-iterable cardinals. We show that the α\alpha-iterable cardinals form a strict hierarchy for αω1\alpha\leq\omega_1, that they are downward absolute to LL for α<ω1L\alpha<\omega_1^L, and that the consistency strength of Schindler's remarkable cardinals is strictly between 1-iterable and 2-iterable cardinals.

Keywords

Cite

@article{arxiv.1104.4448,
  title  = {Ramsey-like cardinals II},
  author = {Victoria Gitman and Philip Welch},
  journal= {arXiv preprint arXiv:1104.4448},
  year   = {2011}
}