Mathematics
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C7X
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All Questions Answers
Score Newest
question
7
How much can $\Delta_0$-definable set functions increase rank?
Apr 27
answer
4
Is it possible to formalize all mathematics in terms of ordinals only?
Mar 3
answer
3
Why do we need ordinal representation systems?
Mar 9
answer
3
Are the ordinals $\alpha$ so that the stable ordinals $< \alpha$ are unbounded in $\alpha$ equivalent to the nonprojectible ordinals $\alpha$
Feb 28
question
2
Iterated $\Pi^1_1$-reflection and non-Gandiness underrepresented in ordinal analyses?
Mar 4
question
2
Definitions of nice recursive analogues of cofinality?
May 15
answer
2
A bit of reverse math fun: how to ensure the existence of the ordinal $\omega^\omega$?
Mar 9
answer
1
Is the output of a Veblen function larger than its input?
Mar 22
answer
1
Relating the cofinality and regular cardinals
Mar 30
answer
1
Well Ordering Principle to prove the Distributive Law of union over the intersection of n sets
Apr 25

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