2009
DOI: 10.1007/s10474-009-9028-7
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Polynomials with all zeros on the unit circle

Abstract: We give a new sucient condition for all zeros of self-inversive polynomials to be on the unit circle, and nd the location of zeros. This generalizes some recent results of Lakatos [7], Schinzel [17], Lakatos and Losonczi [9], [10]. By this sucient condition the mentioned results can be treated in a unied way.

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Cited by 25 publications
(31 citation statements)
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“…So one of natural questions is what kind of reciprocal polynomials have all zeros on the unit circle. This question raised the attention of many polynomialists, e.g., in [2,3,5,[7][8][9][10]12]. In 1922, Cohn [3] found a necessary and sufficient condition under which all the zeros of a reciprocal polynomial have moduli 1.…”
Section: Introduction and Main Resultsmentioning
confidence: 99%
“…So one of natural questions is what kind of reciprocal polynomials have all zeros on the unit circle. This question raised the attention of many polynomialists, e.g., in [2,3,5,[7][8][9][10]12]. In 1922, Cohn [3] found a necessary and sufficient condition under which all the zeros of a reciprocal polynomial have moduli 1.…”
Section: Introduction and Main Resultsmentioning
confidence: 99%
“…Our proofs follow from applying the theorems of Schinzel [13], Lakatos and Losonczi [9], and Lakatos [8]. Lakatos proved that any reciprocal polynomial k j=0 A j z j , with real-valued coefficients, which satisfies…”
Section: S K (Z) Y K (Z) and The Theorems Of Schinzel Lakatos And Lmentioning
confidence: 99%
“…Equation (10) is a very strong restriction. There have been a number of recent improvements to (10) with a similar flavor (see [13] and [9]). Schinzel proved that any self-inversive polynomial which satisfies…”
Section: S K (Z) Y K (Z) and The Theorems Of Schinzel Lakatos And Lmentioning
confidence: 99%
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“…Pesquisas recentes (ver [3,4]) estabelecem condições para que todos os zeros de um polinômio palindrômico estejam localizados em |z| = 1.…”
Section: Introductionunclassified