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 Apr 28 answered Proof of a theorem regarding subsequences and convergence Mar 26 awarded Popular Question Mar 11 awarded Yearling Nov 10 comment Traveling Salesman with exceptions If m=n is a particular case of your problem then it's trivially NP-hard... Nov 2 answered Proving equivalence relations and showing equivalence classes Nov 2 revised Are all mathematical statements true or false? unprovable -> undecidable Sep 10 answered What is the minimum number of guesses in order to guarantee to win the prize? Sep 10 answered Modular arithmetic with different moduli? May 19 awarded Curious May 18 accepted Sufficient condition for integer Hausdorff dimension. May 18 asked Sufficient condition for integer Hausdorff dimension. Mar 11 awarded Yearling Feb 22 awarded Nice Answer Feb 17 comment What is a limit point @TSJ lmgtfy.com/?q=limit+point I believe in your previous remark you had "accumulation points" in mind, i.e. point that are not isolated. Feb 16 comment What is a limit point @TSJ Yes they are, they are limits of constant sequences from $S$... Jan 26 answered Multiplication of rational with irrational number? Jan 22 revised Set Theory: Cardinality of functions on a set have higher cardinality than the set deleted 8 characters in body Jan 22 comment Does $A\times A\cong B\times B$ imply $A\cong B$? Why isnt' it enough to project onto the first component to get $A\cong B$ Jan 22 answered Set Theory: Cardinality of functions on a set have higher cardinality than the set Jan 20 revised Linear space and cardinals remark on S infinite