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Jul 12, 2017 at 22:42 comment added 喻 良 If only consider recursive ordinals, the answer to your question 2 is also yes by Posner-Robinson theorem.
Jul 12, 2017 at 18:01 answer added Joel David Hamkins timeline score: 5
Jul 12, 2017 at 17:48 answer added Noah Schweber timeline score: 5
Jul 12, 2017 at 17:30 history asked Dylan Pizzo CC BY-SA 3.0