Indestructible Weakly Compact Cardinals and the Necessity of Supercompactness for Certain Proof Schemata

Mathematical Logic Quarterly 47 (4):563-572 (2001)
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Abstract

We show that if the weak compactness of a cardinal is made indestructible by means of any preparatory forcing of a certain general type, including any forcing naively resembling the Laver preparation, then the cardinal was originally supercompact. We then apply this theorem to show that the hypothesis of supercompactness is necessary for certain proof schemata

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Joel David Hamkins
Oxford University

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