
Let \(p\geq 5\) be a prime. For elements \(a,b,c\) of the finite field \(\mathbb{F}_p\) the hypergeometric polynomial \(F(a,b,c;x)\) is defined by \[ F(a,b,c;x)=\sum_{n=0} \frac{(a)_n(b)_n}{(1)_n(c)_n}x^n, \] where \((a)_n=a(a+1)\cdots (a+n-1)\) and the sum stops as soon as the numerator vanishes under the assumption that the denominator does not vanish before the numerator vanishes. Moreover, for \(\varepsilon, \varepsilon'\in \{-1,1\}\) let \[ F_{\varepsilon,\varepsilon'}(x)=\prod_a(x-a), \] where \(a\) runs over all elements \(a\in \mathbb{F}_p^*\) satisfying \(\left(\frac{a}{p}\right)=\varepsilon\) and \((\frac{1-a}{p})=\varepsilon',\) where \((\frac{\cdot}{p})\) denotes the Legendre symbol. \textit{T. Honda} [Algebraic geometry, Roma 1979, Symp. Math. 24, 169-204 (1981; Zbl 0464.12013)] evaluated \(F_{-1,\pm 1}(x)\) in terms of hypergeometric polynomials. In the paper under review the author evaluates the remaining polynomials \(F_{1,\pm 1}(x)\): \[ F_{1,-1}(x)=a_{1,-1}^{(p)}F\left(\frac{1}{4},\frac{3}{4},\frac{1}{2};x\right)\text{ and } F_{1,1}(x)=a_{1,1}^{(p)}F\left(\frac{3}{4},\frac{5}{4},\frac{3}{2};x\right), \] where \[ a_{1,-1}^{(p)}=\begin{cases} 1 &\text{if }p\equiv 1\bmod 4,\\ -2&\text{if }p\equiv 3\bmod 4,\end{cases}\quad\text{ and }\quad a_{1,1}^{(p)}=\begin{cases} 1 &\text{if }p\equiv 1\bmod 4,\\ -1/2&\text{if }p\equiv 3\bmod 4.\end{cases}. \]
Special functions in characteristic \(p\) (gamma functions, etc.), 11T06, hypergeometric polynomials, finite fields, Polynomials over finite fields
Special functions in characteristic \(p\) (gamma functions, etc.), 11T06, hypergeometric polynomials, finite fields, Polynomials over finite fields
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