Mathematics
Kevin Long
  • Member for 6 years, 1 month
  • Last seen more than a week ago
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Votes Newest
36
Set builder notation: Colon or Vertical Line
Oct 28 '15
20
Average distance from center of circle
Nov 29 '18
11
Total number of integers relatively prime to $p^2$
Apr 26 '16
6
Problem from a graph theory book
Mar 20 '18
5
Catalan numbers in polygons
Dec 22 '20
5
Combinatorics using averages
Sep 12
5
How to prove $ \sum_{k=3}^n \binom nk \binom k3 =\binom n3 2^{n-3} $
Jan 12 '17
5
How can I prove $R^T\ ;R^T$ is transitive if $R$ is transitive.
Oct 30 '15
4
Prove that there exists a proper subgroup $H$ in a non-abelian group $G$ such that the center of $G$ is a proper subset of $H$
Nov 14 '15
4
Evaluate the sum $ 22\binom{26}{0} + 21\binom{26}{1} + 20\binom{26}{2} + \cdots + (-3)\binom{26}{25} + (-4)\binom{26}{26}. $
Oct 7 '16
Top Meta posts
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28
Questions that specify an approach
14
Should homework questions from advanced subjects be closed?
11
Möbius function tag ambiguity
4
Should there be a notification when a user asks multiple questions in succession?
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Examples of when the professional scientists or mathematicians were wrong, but the nonprofessionals were right
8
Was Paul Cohen a student or assistant of Gödel?

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