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Questions
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battleship permutation

aug 12 at 13:58 J.J. Green 686●5●9

 
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Notation in Frege’s Grundgesetze der Arithmetik: The U with a flourish

oct 17 11 at 18:13 Udo Wermuth 66●1

 
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The plane cut by grids

dec 3 10 at 12:32 J.J. Green 686●5●9