English

The Hartogs-Lindenbaum Spectrum of Symmetric Extensions

Logic 2024-08-20 v2

Abstract

We expand the classic result that ACWO\mathsf{AC}_{\mathsf{WO}} is equivalent to the statement "For all XX, (X)=(X)\aleph(X)=\aleph^*(X)" by proving the equivalence of many more related statements. Then, we introduce the Hartogs-Lindenbaum spectrum of a model of ZF\mathsf{ZF}, and inspect the structure of these spectra in models that are obtained by a symmetric extension of a model of ZFC\mathsf{ZFC}. We prove that all such spectra fall into a very rigid pattern.

Keywords

Cite

@article{arxiv.2309.12100,
  title  = {The Hartogs-Lindenbaum Spectrum of Symmetric Extensions},
  author = {Calliope Ryan-Smith},
  journal= {arXiv preprint arXiv:2309.12100},
  year   = {2024}
}

Comments

16 pages; accepted version