On the consistency of the definable tree property on ℵ

Journal of Symbolic Logic 65 (3):1204 - 1214 (2000)
In this paper we prove the equiconsistency of "Every ω 1 -tree which is first order definable over (H ω 1 ·ε) has a cofinal branch" with the existence of a Π 1 1 reflecting cardinal. We also prove that the addition of MA to the definable tree property increases the consistency strength to that of a weakly compact cardinal. Finally we comment on the generalization to higher cardinals
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DOI 10.2307/2586696
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