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Mathematics
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user642796
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answer
107
Infinite sets don't exist!?
Apr 9, 2013
answer
76
When is the closure of an intersection equal to the intersection of closures?
Apr 10, 2013
answer
61
Show that there's a unique minimum spanning tree if all edges have different costs
Apr 5, 2013
answer
58
An example of neither open nor closed set
Aug 24, 2012
answer
47
Theorems with an extraordinary exception or a small number of sporadic exceptions
Aug 24, 2012
answer
47
Proving that there exists an irrational number in between any given real numbers
Dec 2, 2011
answer
38
How to prove that $ \text{int}(\text{cl}(A)) = \text{cl}(\text{int}(A)) $?
Feb 26, 2013
answer
37
Reference for general-topology
Mar 9, 2012
answer
36
Union of closure of sets is the closure of the union: true for finite, false for infinite unions
Sep 13, 2012
answer
34
Cauchy Sequence that Does Not Converge
Mar 12, 2012
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(homework) tag should be deprecated (Voting's over! You won't believe what won!)
88
'Tis the season to be...
78
Please don't flag posts containing re-purposed ImageShack image URLs as spam
74
Would you like some hats? Yes, please!
71
Fate of the (homework) tag: The community voted.... now what?
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Should heavily-edited answers block self-deletion of questions?
27
Allow moderators to rollback locked posts (more easily)
25
Clicking "privileges" on another user's profile should not show me my own privileges
19
Make the "hats" vs "no hats" choice instead "users can opt out" vs "users can opt in"
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Two versions of "absolutely ccc"