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Jan 26, 2014 at 5:28 comment added Jing Zhang @FrançoisG.Dorais: You are right. Obviously I left out some details thinking that some restriction could be relaxed. See my edit.
Jan 26, 2014 at 5:27 history edited Jing Zhang CC BY-SA 3.0
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Jan 26, 2014 at 1:57 comment added François G. Dorais Isn't every regular $\Delta^0_2$ set the unique branch through a $\Delta^0_2$-tree?
Jan 25, 2014 at 22:36 history asked Jing Zhang CC BY-SA 3.0