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when toggle format what by license comment
Oct 14, 2015 at 1:10 vote accept Dongyang Chen
Oct 14, 2015 at 1:10 comment added Dongyang Chen Thanks, Bill. It seems that there are no proper conditions on $X,Y$ ensuring the question is true.
Oct 13, 2015 at 23:37 history answered Bill Johnson CC BY-SA 3.0