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Tohoku Mathematical Journal
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Tohoku Mathematical Journal
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Hypergeometric polynomials over finite fields

Authors: Koike, Masao;

Hypergeometric polynomials over finite fields

Abstract

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 \[ a_{1,-1}^{(p)}=\begin{cases} 1 &\text{if }p\equiv 1\bmod 4,\\ -2&\text{if }p\equiv 3\bmod 4,\end{cases}\quad\text{ and }\quad a_{1,1}^{(p)}=\begin{cases} 1 &\text{if }p\equiv 1\bmod 4,\\ -1/2&\text{if }p\equiv 3\bmod 4.\end{cases}. \]

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Keywords

Special functions in characteristic \(p\) (gamma functions, etc.), 11T06, hypergeometric polynomials, finite fields, Polynomials over finite fields

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
Green
hybrid