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Chitsai Liu's user avatar
Chitsai Liu's user avatar
Chitsai Liu
  • Member for 14 years, 7 months
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question
47
How to prove this polynomial always has integer values at all integers?
Jun 13, 2015
question
46
Is the following identity true?
Jun 8, 2016
question
29
Suggestions for good books on class field theory
May 15, 2010
question
28
A sum involving roots of unity
Feb 4, 2019
question
21
A combinatorial identity involving generalized harmonic numbers
Dec 22, 2015
question
20
How to prove that the following double sum is always an integer？
Dec 12, 2014
question
15
Prove $4\sum_{k=1}^{p-1}\frac{(-1)^k}{k^2}\equiv 3\sum_{k=1}^{p-1}\frac{1}{k^2}\pmod{p^2}$
Dec 23, 2015
question
15
A combinatorial identity involving harmonic numbers
May 16, 2016
question
15
How to prove $\sum_{k=1}^{\frac{p-1}{2}}\frac{(-1)^k}{k}\sum_{i=\lfloor k/2\rfloor +1}^k\frac{1}{2i-1}\equiv 0\pmod{p}$?
Jun 4, 2017
question
1
Integer Polynomial solutions to functional equation
May 13, 2016
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A combinatorial identity involving generalized harmonic numbers
19
How to prove a double sum is always an integer?
10
Is this combinatorial identity a special case of Saalschutz's theroem?
7
How to prove combinatorial identity $\sum_{k=0}^s{s\choose k}{m\choose k}{k\choose m-s}={2s\choose s}{s\choose m-s}$?
7
How to prove $\sum_{s=0}^{m}{2s\choose s}{s\choose m-s}\frac{(-1)^s}{s+1}=(-1)^m$?