Extension of irreducibility results on generalized Laguerre polynomials $L_n^{(-n-s-1)}(x)$

Let $n$ be a positive integer. We consider the irreducibility of generalized Laguerre polynomials of the form $$L_n^{(-n-s-1)}(x)=\sum_{j=0}^{n}(-1)^n\binom{n+s-j}{n-j}\frac{x^j}{j!}.$$ For different values of $s$, this family gives polynomials which are of great interest. It was proved earlier that for $0\leq s\leq 60$, these polynomials are irreducible over $\mathbb{Q}$, and their Galois groups are shown to be $A_n$ or $S_n$. In this paper, we prove that $L_n^{(-n-s-1)}(x)$ is irreducible for each $s\leq 92$. Also, we prove that $L_n^{(-n-s-1)}(x)$ has no linear factor for each $93\leq s\leq 100$. Furthermore, assuming the irreducibility of $L_n^{(-n-s-1)}(x)$ for $93\leq s\leq 100$, we determine that the Galois group of $L_n^{(-n-s-1)}(x)$ is either $A_n$ or $S_n$ for each $61\leq s\leq 100$.

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Publication Details

Journal
Publicationes Mathematicae Debrecen
Published
2024-10-01
DOI
https://doi.org/10.5486/pmd.2024.9906
Primary Topic
Advanced Differential Equations and Dynamical Systems
Type
article
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article

Extension of irreducibility results on generalized Laguerre polynomials $L_n^{(-n-s-1)}(x)$

Ankita Jindal, Saranya G. Nair, T. N. Shorey
Publicationes Mathematicae Debrecen
Advanced Differential Equations and Dynamical Systems
article

Extension of irreducibility results on generalized Laguerre polynomials $L_n^{(-n-s-1)}(x)$

Ankita Jindal, Saranya G. Nair, T. N. Shorey
article en

Abstract

Let $n$ be a positive integer. We consider the irreducibility of generalized Laguerre polynomials of the form $$L_n^{(-n-s-1)}(x)=\sum_{j=0}^{n}(-1)^n\binom{n+s-j}{n-j}\frac{x^j}{j!}.$$ For different values of $s$, this family gives polynomials which are of great interest. It was proved earlier that for $0\leq s\leq 60$, these polynomials are irreducible over $\mathbb{Q}$, and their Galois groups are shown to be $A_n$ or $S_n$. In this paper, we prove that $L_n^{(-n-s-1)}(x)$ is irreducible for each $s\leq 92$. Also, we prove that $L_n^{(-n-s-1)}(x)$ has no linear factor for each $93\leq s\leq 100$. Furthermore, assuming the irreducibility of $L_n^{(-n-s-1)}(x)$ for $93\leq s\leq 100$, we determine that the Galois group of $L_n^{(-n-s-1)}(x)$ is either $A_n$ or $S_n$ for each $61\leq s\leq 100$.

Publicationes Mathematicae DebrecenVol. 105(3-4)
Openalex Percentile: Top 72%
Advanced Differential Equations and Dynamical Systems
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Extension of irreducibility results on generalized Laguerre polynomials $L_n^{(-n-s-1)}(x)$ — Ankita Jindal, Saranya G. Nair, et al. · Publicationes Mathematicae Debrecen (2024) | TGRS Research Map | TGRS