## New answers tagged combinatorial-identities

13
votes

### Identity involving Pochhammer symbol

You had several nice answers proving the identity from scratch. Let me point out that what you call "Pochhammer symbols identities" is also known as hypergeometric identities. If you ...

8
votes

### Identity involving Pochhammer symbol

[Hopefully this doesnâ€™t end up being only a reformulation of the other solutions.]
The $(-1)^m\frac1{m!(s-m)!}$ makes me think about discrete derivatives: if you define $(\Delta f)(x)=f(x+1)-f(x)$, ...

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