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This article is cited in 1 scientific paper (total in 1 paper)
On Visser's inequality concerning coefficient estimates for a polynomial
S. Gulzara, N. A. Ratherb, M. Sh. Wanib a Government College for Engineering and Technology, India
b University of Kashmir, Srinagar-190006, India
Abstract:
If $P(z)=\sum\limits_{j=0}^{n}a_jz^j$ is a polynomial of degree $n$ having no zero in $|z|<1,$ then it was recently proved that for every $p\in[0,+\infty]$ and $s=0,1,\ldots,n-1,$ \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 $\delta_{0s}$ is the Kronecker delta. In this paper, we consider the class of polynomials having no zero in $|z|<\rho,$ $\rho\geq 1$ and obtain some generalizations of above inequality.
Keywords:
polynomial, Visser's inequality, inequality in the complex domain.
Received: 15.04.2021 Revised: 04.07.2021 Accepted: 29.09.2021
Citation:
S. Gulzar, N. A. Rather, M. Sh. Wani, “On Visser's inequality concerning coefficient estimates for a polynomial”, Izv. Vyssh. Uchebn. Zaved. Mat., 2022, no. 3, 13–20; Russian Math. (Iz. VUZ), 66:3 (2022), 9–15
Linking options:
https://www.mathnet.ru/eng/ivm9755 https://www.mathnet.ru/eng/ivm/y2022/i3/p13
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Abstract page: | 133 | Full-text PDF : | 24 | References: | 38 | First page: | 10 |
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