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Apostolos
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How to decompose an infinite set into two isomorphic ones without choice?
May 1, 2011
question
9
$\Pi_0^1$-weakly indescribable cardinals are exactly the regulars
Oct 9, 2011
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26
Do sets, whose power sets have the same cardinality, have the same cardinality?
19
Polish Spaces and the Hilbert Cube
16
Is the sentence "$(A,\in)\models ZFC$" absolute?
16
Prove 7 divides $15^n+6$ with mathematical induction
15
Prove that $\beta \rightarrow \neg \neg \beta$ is a theorem using standard axioms 1,2,3 and MP