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 Jan 8 awarded Nice Question Nov 12 awarded Benefactor Nov 11 accepted Characterizing sets with a function Nov 11 awarded Promoter Nov 7 revised Characterizing sets with a function added 11 characters in body Nov 7 asked Characterizing sets with a function Nov 6 comment Closure of a subset in a metric space @ShinningStar you are right, I deleted my incorrect comment as the definition given in your comment is the intended one. Nov 4 awarded Yearling Nov 1 awarded Good Question Oct 10 awarded Popular Question Jul 30 awarded Enlightened Jul 30 awarded Nice Answer Jul 5 accepted Sum of quotients Jul 5 comment Sum of quotients Why can we assume that these tuples are ordered? We have $x_i\leq y$ but not $x_i\leq x_{i+1}$. Jul 5 comment Show that $\sup (A\cdot B)=\max\{\sup A\cdot\sup B, \sup A\cdot\inf B,\inf A\cdot\sup B,\inf A\cdot\inf B\}$ It is not true that $\sup(A\cdot B)=\sup A\cdot \sup B$ if $\sup A>0$ and $\sup B>0$. See for example $A=\{1,-2\},B=\{1,-2\}$ then $\sup(A\cdot B)=4$. Jul 4 reviewed Approve Special case on counting in a string of 7 letters Jul 4 asked Sum of quotients May 19 awarded Popular Question Apr 14 awarded Nice Answer Nov 25 awarded Popular Question