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 $61\leq s\leq 100$.
Authors
- Ankita Jindal
- Saranya G. Nair (ORCID: https://orcid.org/0000-0002-2148-9074)
- T. N. Shorey
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
- Field-Weighted Citation Impact
- 0.00