User qifeng618 - Web Applications Stack Exchange

qifeng618

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I am a Chinese mathematician. My full name in English is Feng Qi. For more information on me, please visit the following sites:

https://research.com/u/feng-qi

https://qifeng618.wordpress.com

https://www.researchgate.net/profile/Feng_Qi

https://orcid.org/0000-0001-6239-2968

https://scholar.google.com/citations?user=Q-wGSBYAAAAJ

https://www.webofscience.com/wos/author/record/G-2455-2012

https://www.growkudos.com/profile/feng_qi

https://www.semanticscholar.org/author/Feng-Qi/143785202

http://www.scopus.com/authid/detail.url?authorId=7101777278

http://www.ams.org/mathscinet/search/author.html?mrauthid=610520

https://zbmath.org/authors/?q=ai:qi.feng

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Sep 23, 2021

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7

Is the Gauss hypergeometric series ${}_2F_1\bigl(\frac{1}{2},\frac{1}{2};2;t\bigr)$ an elementary function?

7

What is the general formula of the sum $\sum_{k=0}^{n}(-1)^{k} \binom{n}{k}\binom{k/2}{m}$ for $m,n\in\mathbb{N}$?

6

Can we prove AM-GM Inequality using these integrals?

5

How to prove the combinatorial identity $\sum_{k=\ell}^{n}\binom{2n-k-1}{n-1}k2^k=2^\ell n\binom{2n-\ell}{n}$ for $n\ge\ell\ge0$?

5

Ask for a proof of logarithmically complete monotonicity of a power-exponential function involving the difference of the psi and logarithmic functions