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Questions
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1
10
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3
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Differentiability of computable functions

aug 10 10 at 21:47 François G. Dorais♦ 22.3k●2●48●113

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8
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6
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Questions about ordering of reals and irrationals

dec 1 09 at 16:56 Joel David Hamkins 74.7k●7●187●343

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Ordinals that are not sets

jan 13 10 at 7:50 Steven Sam 5,270●1●16●35

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4
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Higher-rank Borel sets

jan 1 10 at 23:18 Ashutosh 1,841●6●13