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Danielle Ulrich's user avatar
Danielle Ulrich's user avatar
Danielle Ulrich's user avatar
Danielle Ulrich
  • Member for 11 years
  • Last seen more than 1 year ago
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19
What is the Cantor-Bendixson rank of the space of first order theories?
16
Can an ultrapower be undone by forcing?
16
Is there a theorem whose only known proof uses "$A$ or not $A$" for undecidable $A$
11
The "zig-zag comb" weakly deformation retracts to the central zig-zag line
10
When is $\mathbb{L}$-rank definable in inner models of $\mathbb{V} = \mathbb{L}$?

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