English

Prikry-type forcing and the set of possible cofinalities

Logic 2022-01-10 v1

Abstract

It is known that the set of possible cofinalities pcf(A)\mathrm{pcf}(A) has good properties if AA is a progressive interval of regular cardinals. In this paper, we give an interval of regular cardinals AA such that pcf(A)\mathrm{pcf}(A) has no good properties in the presense of a measurable cardinal, or in generic extensions by Prikry-type forcing.

Keywords

Cite

@article{arxiv.2201.02322,
  title  = {Prikry-type forcing and the set of possible cofinalities},
  author = {Kenta Tsukuura},
  journal= {arXiv preprint arXiv:2201.02322},
  year   = {2022}
}
R2 v1 2026-06-24T08:42:31.408Z