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William

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

reverse-math lo.logic

jun 5 12 at 16:21 François G. Dorais♦ 23.2k●2●52●116

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The Reverse Mathematics of writing a set as a union?

lo.logic reverse-math

jul 28 11 at 1:49 Carl Mummert 4,972●1●16●28

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Wadge Determinacy of some related classes.

descriptive-set-theory set-theory

aug 20 at 3:22 MathOverflow♦ 1●2●3

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reverse-math× 2
lo.logic× 2
set-theory
descriptive-set-theory

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