LOCATION OF ZEROS OF CERTAIN POLYNOMIALS IN ANNULAR REGIONS
Print ISSN: 0972-7752 | Online ISSN: 2582-0850 | Total Downloads : 172
DOI:
Author :
P. Ramulu (Department of Mathematics, M. V. S Govt. Arts and Science College(Autonomous), Mahabubnagar - 509001, Telangana, INDIA)
G. L. Reddy (School of Mathematics and Statistics, University of Hyderabad, Hyderabad - 500046, INDIA)
C. Gangadhar (School of Mathematics and Statistics, University of Hyderabad, Hyderabad - 500046, INDIA)
Abstract
The famous Enestr\"{o}m-Kakeya Theorem states that a polynomial $ P(z)=\sum_{i=0}^{n} a_iz^i$ with real positive coefficients satisfying $0\textless {a_0}\leq {a_1}\leq...\leq{a_n}$ has all its zeros in $|z|\leq{1}$. Various generalizations of this result are available in the literature. In this paper we put certain restrictions on the real and imaginary parts of the coefficients of a polynomial and find annular regions containing all the zeros of the polynomial. Our results generalize many results already known in the literature.
Keywords and Phrases
Zeros of polynomial, Enestr\"{o}m-Kakeya theorem.
A.M.S. subject classification
12D10, 26C10 30C10, 30C15.
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