A Type of Eneström-Kakeya Theorem for Quaternionic Polynomials Involving Monotonicity with a Reversal

Gardner, Robert B.; Gladin, Matthew

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Title: A Type of Eneström-Kakeya Theorem for Quaternionic Polynomials Involving Monotonicity with a Reversal

Volume:

Number:

ISSN:

1829-1163

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Contributor(s):

Գլխ. խմբ.՝ Անրի Ներսեսյան ; Պատ. խմբ.՝ Լինդա Խաչատրյան ; Խմբ. տեղակալ՝ Ռաֆայել Բարխուդարյան

Coverage:

1-10

Abstract:

The Eneström-Kakeya theorem states that if P ( z ) = ∑ n ℓ = 0 a ℓ z ℓ is a polynomial of degree n with real coefficients satisfying 0 ≤ a 0 ≤ a 1 ≤ ⋯ ≤ a n , then all zeros of P lie in | z | ≤ 1 in the complex plane. Motivated by recent results concerning an Eneström-Kakeya "type" condition on the real and imaginary parts of complex coefficients, we give similar results with hypotheses concerning the real and imaginary parts of the coefficients of a quaternionic polynomial. We give bounds on the moduli of quaternionic zeros of such polynomials.