Abstract
We give a proof ofTheorem 1. Let κ be the smallest cardinal such that the free subset property Fr ω (κ,ω 1)holds. Assume κ is singular. Then there is an inner model with ω1 measurable cardinals.
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Koepke, P. On the free subset property at singular cardinals. Arch Math Logic 28, 43–55 (1989). https://doi.org/10.1007/BF01624082
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DOI: https://doi.org/10.1007/BF01624082