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# Questions

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### Does the fact that this vector space is not isomorphic to its double-dual require choice?

apr 5 12 at 9:56 Asaf Karagila 7,24311444

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### Teaching undergraduate students to write proofs

jan 20 11 at 8:25 Bob Pego 14

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### Is the set of cube-free binary sequences perfect?

apr 19 11 at 15:02 Amit Kumar Gupta 2,9091026

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### How much of ZFC does Quine’s New Foundations prove?

may 3 at 17:33 Thomas Forster 45123

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### Should there be a true model of set theory?

nov 6 10 at 20:12 Amit Kumar Gupta 2,9091026

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### Reference letters for teaching positions

jul 12 11 at 0:42 Andrew 95116

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### Why is this theorem (about $L(P(\omega_1))^V$ and $L(P(\omega_1))^{V[G]}$) nice?

jul 22 11 at 4:38 François G. Dorais 22.6k248113

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### Is every p-point ultrafilter Ramsey?

may 6 11 at 17:27 Goldstern 5,26011227

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### Decomposing posets into countably many chains

jan 25 11 at 10:25 François G. Dorais 22.6k248113

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