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when toggle format what by license comment
Oct 28, 2014 at 11:39 comment added Emil Jeřábek You might be interested in meta.mathoverflow.net/a/578 (with hairy details at meta.mathoverflow.net/a/542).
Oct 27, 2014 at 19:33 comment added Włodzimierz Holsztyński Of course the @JohnPardon's answer covers all possibilities. However, Kazimierz Kuratowski used to say that an example should be the simplest possible.
Oct 27, 2014 at 19:30 history answered Włodzimierz Holsztyński CC BY-SA 3.0