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Jul 25 at 15:28 comment added Monroe Eskew Here is a proof of $\Sigma^2_1$ absolulteness. arxiv.org/abs/1005.4193 Farah has another paper show this using a saturated ideal instead of the extender algebra: mathscinet.ams.org/mathscinet-getitem?mr=2322360
Jul 25 at 13:30 history asked sobach'e_pole CC BY-SA 4.0