How far is almost strong compactness from strong compactness

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Journal of Mathematical Logic (forthcoming)
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Abstract

Journal of Mathematical Logic, Ahead of Print. Bagaria and Magidor introduced the notion of almost strong compactness, which is very close to the notion of strong compactness. Boney and Brooke-Taylor asked whether the least almost strongly compact cardinal is strongly compact. Goldberg gives a positive answer in the case [math] holds from below and the least almost strongly compact cardinal has uncountable cofinality. In this paper, we give a negative answer for the general case. Our result also gives an affirmative answer to a question of Bagaria and Magidor.

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10.1142/s0219061324500090

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