Is there a way to simplify anyhow (also taking some limits of big/small parameters) the following hypergeometric function $_2F_1(1,-a,-a-b,1)$ for integer values of both $a$ and $b$ ?
2026-03-25 17:17:06.1774459026
Hypergeometric Function simplification
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Using the Chu-Vandermonde identity (a special case of Gauss's theorem) in the case of $a$ a positive integer, we have
$$\begin{align*} {}_2 F_1\left({{-a,1}\atop{-a-b}}\middle|1\right)&=\frac{(-a-b-1)_a}{(-a-b)_a}\\ &=\frac{\frac{(-1)^a(a+b+1)!}{(b+1)!}}{\frac{(-1)^a(a+b)!}{b!}}=\frac{a+b+1}{b+1} \end{align*}$$