Mathematics
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96 Infinite sets don't exist!? Apr 9 '13
55 When is the closure of an intersection equal to the intersection of closures? Apr 10 '13
49 Show that there's a unique minimum spanning tree if all edges have different costs Apr 5 '13
48 An example of neither open nor closed set Aug 24 '12
44 Theorems with an extraordinary exception or a small number of sporadic exceptions Aug 24 '12
37 Proving that there exists an irrational number in between any given real numbers Dec 2 '11
37 How to prove that $ \text{int}(\text{cl}(A)) = \text{cl}(\text{int}(A)) $? Feb 26 '13
31 Reference for general-topology Mar 9 '12
29 Cauchy Sequence that Does Not Converge Mar 12 '12
29 Union of closure of sets is the closure of the union: true for finite, false for infinite unions Sep 13 '12
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