Which pairs of cardinals can be Hartogs and Lindenbaum numbers of a set?

Autorzy

Dane publikacji

  • DOI: 10.4064/fm231006-14-8

  • Tom 267

  • Zeszyt 3

  • Czasopismo: Fundamenta Mathematicae

  • Strony: 231-241

  • Data publikacji online: 06.11.2024

Liczba wyświetleń: 0

Liczba pobrań: 0

Abstrakt

Given any $\lambda \leq \kappa $, we construct a symmetric extension in which there is a set $X$ such that $\aleph (X)=\lambda $ and $\aleph ^*(X)=\kappa $. Consequently, we show that $\mathsf{ZF} {}+{}$“for all pairs of infinite cardinals $\lambda \leq \kappa $ there is a set $X$ such that $\aleph (X)=\lambda \leq \kappa =\aleph ^*(X)$” is consistent.