On the spectrum of characters of ultrafilters

Abstract

We show that the character spectrum $S{p}_{\chi }(\lambda )$, for a singular cardinal $\lambda$ of countable cofinality, may include any prescribed set of regular cardinals between $\lambda$ and $2^{\lambda }$.

Cited by in corpus (3)

• Cardinal characteristics at aleph omega
• Cofinal types of ultrafilters over measurable cardinals
• Problems on $\beta \mathbb{N}$