English

On Recurrence Axioms

Logic 2025-06-24 v3

Abstract

The Recurrence Axiom for a class P\mathcal{P} of \pos\ and a set AA of parameters is an axiom scheme in the language of ZFC asserting that if a statement with parameters from AA is forced by a poset in P\mathcal{P}, then there is a ground containing the parameters and satisfying the statement. The tightly super-C()C^{(\infty)}-P\mathcal{P}-Laver generic hyperhuge continuum implies the Recurrence Axiom for P\mathcal{P} and H(20)\mathcal{H}(2^{\aleph_0}). The consistency strength of this assumption can be decided thanks to our main theorems asserting that the minimal ground (bedrock) exists under a tightly P\mathcal{P}-generic hyperhuge cardinal κ\kappa, and that κ\kappa in the bedrock is genuinely hyperhuge, or even super C()C^{(\infty)} hyperhuge if κ\kappa is a tightly super-C()C^{(\infty)}-P\mathcal{P}-Laver generic hyperhuge definable cardinal. The Laver Generic Maximum (LGM), one of the strongest combinations of axioms in our context, integrates practically all known set-theoretic principles and axioms in itself, either as its consequences or as theorems holding in (many) grounds of the universe. For example, double plus version of Martin's Maximum is a consequence of LGM while Cicho\'n's Maximum is a phenomenon in many grounds of the universe under LGM.

Keywords

Cite

@article{arxiv.2402.02693,
  title  = {On Recurrence Axioms},
  author = {Sakaé Fuchino and Toshimichi Usuba},
  journal= {arXiv preprint arXiv:2402.02693},
  year   = {2025}
}
R2 v1 2026-06-28T14:38:02.683Z