English

On some resultants formulas of Schur type

Number Theory 2022-04-26 v1

Abstract

Let (rA,n(x))nN(r_{A,n}(x))_{n \in \mathbb{N}} be a sequence of polynomials with coefficients from a field KK satisfying the recurrence relation rA,n(x)=αmtα,n(x)rA,nα(x)r_{A,n}(x)= \sum_{|\alpha|\leq m} t_{\alpha,n}(x)\textbf{r}_{A,n}^\alpha(x) of order d+1N+d+1 \in \mathbb{N}_{+}, where tα,nK[x]t_{\alpha,n} \in K[x], mN+m \in \mathbb{N}_{+} are fixed, αNd+1\alpha \in \mathbb{N}^{d+1}, α=α0++αd|\alpha| = \alpha_0 + \ldots+\alpha_d and rA,nα(x)=rA,n1α0(x)rA,n2α1(x)rA,nd1αd(x).\textbf{r}_{A,n}^\alpha(x)=r_{A,n-1}^{\alpha_0}(x)r_{A,n-2}^{\alpha_1}(x)\cdots r_{A,n-d-1}^{\alpha_d}(x). We show that under mild assumptions on the initial polynomials rA,0,,rA,dr_{A,0}, \ldots, r_{A,d} and the coefficients tα,nt_{\alpha,n}, we can give the expression for the resultant Res(rA,n,rA,n1)\text{Res}(r_{A,n}, r_{A,n-1}). Our results generalize recent result of Ulas concerning the case m=1m=1 and d=1d=1.

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Cite

@article{arxiv.2204.11052,
  title  = {On some resultants formulas of Schur type},
  author = {Joanna Turaj},
  journal= {arXiv preprint arXiv:2204.11052},
  year   = {2022}
}

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12 pages