The minimal cofinality of an ultrapower of ω and the cofinality of the symmetric group can be larger than b+

Publisher: Cambridge University Press

E-ISSN: 1943-5886|76|4|1322-1340

ISSN: 0022-4812

Source: The Journal of Symbolic Logic, Vol.76, Iss.4, 2011-12, pp. : 1322-1340

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Abstract