Mixed Levels of Indestructibility

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Dane publikacji

  • DOI: 10.4064/ba63-2-2

  • Tom 63

  • Zeszyt 2

  • Czasopismo: Bulletin of the Polish Academy of Sciences Mathematics

  • Strony: 113-122

Liczba wyświetleń: 0

Liczba pobrań: 0

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Abstrakt

Starting from a supercompact cardinal $\kappa $, we force and construct a model in which $\kappa $ is both the least strongly compact and least supercompact cardinal and $\kappa $ exhibits mixed levels of indestructibility. Specifically, $\kappa $'s strong compactness, but not its supercompactness, is indestructible under any $\kappa $-directed closed forcing which also adds a Cohen subset of $\kappa $. On the other hand, in this model, $\kappa $'s supercompactness is indestructible under any $\kappa $-directed closed forcing which does not add a Cohen subset of $\kappa $.