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Sun's curious identity
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Sun's curious identity : ウィキペディア英語版
Sun's curious identity
In combinatorics, Sun's curious identity is the following identity involving binomial coefficients, first established by Zhi-Wei Sun in 2002:
:
(x+m+1)\sum_^m(-1)^i\dbinom\dbinom
-\sum_^\dbinom(-4)^i=(x-m)\dbinom.

After Sun's publication of this identity, five other proofs were obtained by various mathematicians: they are Panholzer and Prodinger's proof via generating functions, Merlini and Sprugnoli's proof using Riordan arrays, Ekhad and Mohammed's proof by the WZ method, Chu and Claudio's proof with the help of Jensen's formula, and Callan's combinatorial proof involving dominos and colorings.
==References==

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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Sun's curious identity」の詳細全文を読む



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