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# Questions

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### Is this Negativstellensatz with uniform denominators known?

dec 31 10 at 20:42 Gerry Myerson 15.6k14787

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### Alternative axiom to induction

jul 8 10 at 14:24 kpj 1

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### Is there an intrinsic definition of fractal (i.e. not embedded in euclidean space)?

may 18 10 at 14:22 Tom Boardman 1,52611120

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### Ways to prove an inequality

may 29 at 20:00 Pietro Majer 19.7k12469

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### How do Lie groups classify geometry?

oct 15 10 at 15:46 Peter Arndt 6,8681842

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### Compatibility of braids as a simplicial set and as a braided monoidal category

sep 25 10 at 23:46 YBL 4,06611428

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### Suggestions for wiki farm with good latex support

jun 26 11 at 22:08 Predrag Punosevac 34139

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### Using the multiverse approach to decide the law of the exluded middle?

may 21 10 at 0:05 Colin Tan 4,1911343

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### Are there sigma-algebras of cardinality $\kappa>2^{\aleph_0}$ with countable cofinality?

sep 3 10 at 15:01 Stefan Geschke 10.5k11437

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