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$\Delta^1_2$-well ordering vs $\Delta^1_3$

dec 15 at 17:41 Andres Caicedo 14.4k●1●42●79

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Decomposing $\mathbf{\Pi}^1_1$ sets into closed sets

sep 1 at 21:22 MathOverflow♦ 1●2●3

 
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ZFC+``every analytical set is measurable"

apr 29 12 at 7:24 Liang Yu 670●5●8

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Countable admissible ordinals

feb 3 at 19:57 Theodore Slaman 331●2●3