English

On Visser's inequality concerning coefficient estimates for a polynomial

Complex Variables 2024-12-02 v1

Abstract

If P(z)=j=0najzjP(z)=\sum_{j=0}^{n}a_jz^j is a polynomial of degree nn having no zero in z<1,|z|<1, then it was recently proved that for every p[0,+]p\in[0,+\infty] and s=0,1,,n1,s=0,1,\ldots,n-1, \begin{align*} \left\|a_nz+\frac{a_s}{\binom{n}{s}}\right\|_{p}\leq \frac{\left\|z+\delta_{0s}\right\|_p}{\left\|1+z\right\|_p}\left\|P\right\|_{p}, \end{align*} where δ0s\delta_{0s} is the Kronecker delta. In this paper, we consider the class of polynomials having no zero in z<ρ,|z|<\rho, ρ1\rho\geq 1 and obtain some generalizations of above inequality.

Keywords

Cite

@article{arxiv.2411.19831,
  title  = {On Visser's inequality concerning coefficient estimates for a polynomial},
  author = {Suhail Gulzar and N. A. Rather and M. S Wani},
  journal= {arXiv preprint arXiv:2411.19831},
  year   = {2024}
}

Comments

Polynomials; Visser's inequality; Inequalities in the complex domain

R2 v1 2026-06-28T20:17:02.104Z