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WhatsUp
  • Member for 8 years, 9 months
  • Last seen more than a week ago
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Top posts
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question
33
On the polynomial $\sum_{k=0}^n\binom{n}{k}(-1)^kX^{k(n-k)}$
Mar 28, 2018
answer
25
The $2\pi$ in the definition of the Fourier transform
Mar 23, 2017
answer
23
A finite alternating sum
Oct 27, 2019
answer
20
Inverse of special upper triangular matrix
Aug 29, 2017
answer
19
Harmonic sums and elementary number theory
Dec 1, 2019
answer
14
Generalizing a problem to make it easier
Jul 5, 2020
answer
13
Is it true that $\sum_{k=m}^n\frac{\sigma(k)}k\not\in\mathbb Z$ for all derangements $\sigma\in S_n$ and $1\le m\le n$?
Nov 27, 2018
question
9
Average size of extreme points of convex hull of $N$ points
Jun 20, 2017
question
9
Is an integral sum of periodic vectors always a sum of integral periodic vectors?
Sep 19, 2019
answer
9
If $x_{n+1}= \frac{nx_{n}^2+1}{n+1}$ then $x_{n}=1$
Aug 13, 2017
Top network posts
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27
Right-Turn-Only Maze
26
Which person is telling the truth?
26
The "Loop of rope" dilemma
21
If O^3=DAD and (IM)^2=MOM, then what is MAID?
21
Prime tree game