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Dec 1, 2014 at 12:58 history edited user9072
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Mar 19, 2010 at 21:12 vote accept Ivan K.
Mar 19, 2010 at 18:51 answer added Sergei Ivanov timeline score: 10
Mar 19, 2010 at 18:37 answer added gowers timeline score: 7
Mar 19, 2010 at 18:32 comment added gowers Yes. Just pick a single square and then make sure that the image of every open set is equal to that square -- which can be done in many ways.
Mar 19, 2010 at 17:32 comment added Tony Huynh Is it easy to come up with such a function without the onto restriction?
Mar 19, 2010 at 17:09 history asked Ivan K. CC BY-SA 2.5