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Questions
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A question about ordinal definable real numbers

mar 30 12 at 6:22 MathOverflow♦ 1●2●3

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Is there a good argument for why you can’t place 4 queens which cover a chessboard?

jul 23 10 at 14:23 Andrey Rekalo 13.9k●1●32●68

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What is the smallest cardinal number of a set that requires the axiom of choice to prove that it exists and is non-empty?

apr 24 10 at 10:51 Joel David Hamkins 75.2k●7●187●343

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How thinly connected can a closed subset of Hilbert space be?

oct 22 11 at 19:58 Sergey Melikhov 3,692●12●19

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A question about J.H. Conway’s SURREAL NUMBERS

may 26 at 1:12 Spice the Bird 940●3●14

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694
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A question about fields of real numbers.

jun 7 10 at 15:32 François G. Dorais♦ 22.6k●2●48●113

 
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Can the circle be characterized by the following property?

apr 20 10 at 17:18 Scott Morrison♦ 4,460●4●26●44

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A question about unbounded connected subsets of the plane.

aug 27 10 at 20:18 Pietro Majer 19.7k●1●24●69

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Is an old geometric problem still open?

jul 10 10 at 21:03 Andrey Rekalo 13.9k●1●32●68

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A question about Second-Order ZFC and the Continuum Hypothesis

oct 14 11 at 7:18 François G. Dorais♦ 22.6k●2●48●113

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