AI 中文总结
该研究借助法阿·迪·布鲁诺公式等建立高斯超几何函数显式公式,进而导出两个组合恒等式,推广了已有组合恒等式,核心方法是公式推导,主要贡献为新的组合恒等式及其推广。
AI 中文摘要
本文借助法阿·迪·布鲁诺公式和部分贝尔多项式的恒等式,建立了高斯超几何函数\({\,}_2F_1\biggl(\frac{1 - n}{2},\frac{2 - n}{2};\frac{3}{2} - m;z^2\biggr)\)等的显式公式,其中\(m,n\in\mathbb{N}\),\(a\in\mathbb{C}\)。然后推导出两个组合恒等式,这些新建立的恒等式推广了一个已有的组合恒等式。实验设置为利用相关公式推导,结果是得到新的组合恒等式,结论是推广了已有恒等式,具有重要意义。
英文摘要
In present paper, with the help of the Faà di Bruno formula and identities of partial Bell polynomials, the author establishes explicit formulas of the Gauss hypergeometric functions \begin{gather*} {\,}_2F_1\biggl(\frac{1-n}{2},\frac{2-n}{2};\frac{3}{2}-m;z^2\biggr), \quad {\,}_2F_1\biggl(-\frac{n}{2},\frac{1-n}{2};\frac{1}{2}-m;z^2\biggr),\\ {\,}_2F_1\biggl(a,a+\frac{1}{2};\frac{3}{2}-m;z^2\biggr), \quad {\,}_2F_1\biggl(a,a+\frac{1}{2};\frac{1}{2}-m;z^2\biggr) \end{gather*} for $m,n\in\mathbb{N}$ and $a\in\mathbb{C}$, and then derives two combinatorial identities \begin{equation*} \sum_{k=0}^{m}\frac{2^k}{k!} \binom{2m-2k}{m-k} \sum_{\ell=0}^{k} \frac{(-1)^\ell}{2^\ell} \frac{(2k-2\ell-1)!!}{(n-\ell)!} \binom{2k-\ell-1}{\ell-1} =\frac{1}{n!}\binom{2m-n}{m} \end{equation*} and \begin{equation*} \sum_{k=1}^{m}\frac{1}{(k!)^2}\binom{2m-2k}{m-k} \sum_{\ell=1}^{k} \binom{k}{\ell}\ell(2k-\ell-1)! (2a)_\ell =\binom{2m+2a}{m}, \end{equation*} where $m\in\mathbb{N}_0$, $n\in\mathbb{Z}$, and $a\in\mathbb{C}$. These newly-established identities generalize the nice and beautiful combinatorial identity \begin{equation*} \sum_{k=0}^{n} \frac{2^{k}}{k!}\binom{2n-2k}{n-k} \sum_{j=0}^{k}\frac{(-1)^{j}}{2^j} \frac{(2k-2j-1)!!}{(n-j)!} \binom{2k-j-1}{j-1} =\frac{1}{n!}, \quad n\in\mathbb{N}_0, \end{equation*} which was obtained in Theorem 4 of the recent paper "F. Qi, C.-Y. He, and D. Lim, Explicit formulas of two Gauss hypergeometric functions and several combinatorial identities, Discrete Appl. Math., Vol. 393 (2026), 215--229. DOI: https://doi.org/10.1016/j.dam.2026.06.023".
Comments15 pages