Mathematics
Kevin Long's user avatar
Kevin Long's user avatar
Kevin Long's user avatar
Kevin Long
  • Member for 6 years, 11 months
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All Questions Answers
Score Newest
question
40
Set builder notation: Colon or Vertical Line
Oct 28, 2015
question
21
Average distance from center of circle
Nov 29, 2018
answer
11
Total number of integers relatively prime to $p^2$
Apr 26, 2016
answer
6
Problem from a graph theory book
Mar 20, 2018
answer
5
How to prove $ \sum_{k=3}^n \binom nk \binom k3 =\binom n3 2^{n-3} $
Jan 12, 2017
answer
5
How can I prove $R^T\ ;R^T$ is transitive if $R$ is transitive.
Oct 30, 2015
answer
5
Catalan numbers in polygons
Dec 22, 2020
answer
5
Combinatorics using averages
Sep 12, 2021
answer
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, 2015
answer
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, 2016
Top Meta posts
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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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