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edited Mar 14 2010 at 6:37

François G. Dorais♦
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I have always found Kuratowski 14-set problem among the most surprising elementary theorems I know. Why 14?! (This was recently discussed in this MO question.)

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answered Mar 14 2010 at 2:10

José Figueroa-O'Farrill
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I have always found Kuratowski 14-set problem among the most surprising elementary theorems I know. Why 14?! (This was recently discussed in this MO question.)