On the spectrum of characters of ultrafilters

by Garti and Magidor and Shelah. [GaMaSh:1040]

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 . newline Nous prouvons que Sp_chi (lambda) (par un cardinal singulier lambda avec cofinalit `e nombrable) peut comporter tout l'ensemble prescrit de cardinaux reguliers entre lambda et 2^lambda .

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