On the spectrum of characters of ultrafilters
classification
🧮 math.LO
keywords
lambdaspectrumcardinalcardinalscharactercharacterscofinalitycountable
read the original abstract
We show that the character spectrum $Sp_\chi(\lambda)$, for a singular cardinal $\lambda$ of countable cofinality, may include any prescribed set of regular cardinals between $\lambda$ and $2^\lambda$.
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