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Wadge Determinacy of some related classes.

aug 20 at 3:22 MathOverflow♦ 1●2●3

 
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Strength of $\Delta_1^0$ subset of $2^\mathbb{N}$ as finite union of specific basic open sets.

jun 5 at 16:21 François G. Dorais♦ 22.4k●2●48●113

 
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The Reverse Mathematics of writing a set as a union?

jul 28 11 at 1:49 Carl Mummert 4,838●1●15●27