Dane publikacji
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.