English

$omega_{1}$ under $Pi_{1}$-Collection

Logic 2015-08-10 v1

Abstract

We describe a proof-theoretic bound on Sigma2Sigma_{2}-definable countable ordinals in Kripke-Platek set theory with Pi1Pi_{1}-Collection and the existence of omega1omega_{1}.

Keywords

Cite

@article{arxiv.1508.01547,
  title  = {$omega_{1}$ under $Pi_{1}$-Collection},
  author = {Toshiyasu Arai},
  journal= {arXiv preprint arXiv:1508.01547},
  year   = {2015}
}

Comments

arXiv admin note: substantial text overlap with arXiv:1101.5660

R2 v1 2026-06-22T10:28:14.118Z