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Jan 15, 2016 at 20:47 vote accept Richard Rast
Jan 15, 2016 at 18:06 comment added Lajos Soukup Based on Miller's idea, Zoltan Vidnyanszky proved a black box theorem in his paper Transfinite inductions producing coanalytic sets. His result can be used to obtain co-analytic examples in many similar situations.
Jan 15, 2016 at 17:20 history answered Ali Enayat CC BY-SA 3.0