Unimodularity of zeros of self-inversive polynomials |
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Authors: | Matilde N Lal??n Chris J Smyth |
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Institution: | 1. D??partement de math??matiques et de statistique, Universit?? de Montr??al, CP 6128, succ. Centre-ville, Montreal, QC, H3C 3J7, Canada 2. School of Mathematics and Maxwell Institute for Mathematical Sciences, University of Edinburgh, Edinburgh, EH9 3JZ, Scotland
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Abstract: | We generalise a necessary and sufficient condition given by Cohn for all the zeros of a self-inversive polynomial to be on the unit circle. Our theorem implies some sufficient conditions found by Lakatos, Losonczi and Schinzel. We apply our result to the study of a polynomial family closely related to Ramanujan polynomials, recently introduced by Gun, Murty and Rath, and studied by Murty, Smyth and Wang as well as by Lalín and Rogers. We prove that all polynomials in this family have their zeros on the unit circle, a result conjectured by Lalín and Rogers on computational evidence. |
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