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Monroe Eskew's user avatar
Monroe Eskew's user avatar
Monroe Eskew's user avatar
Monroe Eskew
  • Member for 14 years
  • Last seen this week
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Diamonds at $\omega_2$ under PFA
I believe you can find a proof in Foreman and Magidor, "Large cardinals and definable counterexamples to CH".
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Iteration of $\aleph_2$-properness
@MohammadGolshani Thanks for the reference. It looks like a large antichain is explicitly constructed; no hint on the surface as to whether it collapses $\aleph_2$.
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Iteration of $\aleph_2$-properness
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Czelakowski's claimed proof of the Twin Prime Conjecture
It's amazing that this abstract logical judo would have any bearing on Twin Primes.
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What is the evidence for and against the HOD conjecture?
I admit though that my answer is probably off because it doesn't seem that the more recent results add weight to the argument against the HOD conjecture. (At least as I've framed it; maybe Bagaria has more to say.)
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What is the evidence for and against the HOD conjecture?
@GabeGoldberg But these choiceless cardinals have been studied for a long time, including by Woodin himself. Was there a special reason he thought he was on the way to refuting them? By analogy one might come up with some combinatorial statement about $H_{\omega_4}$ that one conjectures should be a ZFC theorem, but if supercompacts show that the negation is consistent, then in practice that settles the question. It would be weird to hold on to the original intuition and insist that this is evidence for the inconsistency of supercompacts.
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Pedagogically intuitive reformulation of Zorn's Lemma for functional analysis
What about stating Zorn’s Lemma only for the case of partial orders of subsets of a given set ordered by inclusion?
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Who needs Replacement anyway?
@DavidRoberts I always interpreted these quotes in the blog as describing what subsets of the ZF axioms are needed for BD, in particular that the subtheory Z is not enough.
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Who needs Replacement anyway?
@user76284 I find that to be a rather silly argument. No one claimed it is equivalent to the replacement scheme.
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