A Class of Littlewood Polynomials that are Not L α -Flat

Author:

Abdalaoui El Houcein El1,Nadkarni Mahendra2

Affiliation:

1. Department of Mathematics , Normandy University of Rouen , LMRS UMR 6085 CNRS , France

2. Department of Mathematics , University of Mumbai , India

Abstract

Abstract We exhibit a class of Littlewood polynomials that are not L α -flat for any α ≥ 0. Indeed, it is shown that the sequence of Littlewood polynomials is not L α -flat, α ≥ 0, when the frequency of −1 is not in the interval ] 1 4 {1 \over 4} , 3 4 {3 \over 4} [ We further obtain a generalization of Jensen-Jensen-Hoholdt’s result by establishing that the sequence of Littlewood polynomials is not L α -flat for any α> 2 if the frequency of 1 is not 1 2 {1 \over 2} . Finally, we prove that the sequence of palindromic Littlewood polynomials with even degrees are not L α -flat for any α ≥ 0, and we provide a lemma on the existence of c-flat polynomials.

Publisher

Walter de Gruyter GmbH

Reference31 articles.

1. [1] EL ABDALAOUI, E. H.: Ergodic Banach problem, flat polynomials and Mahler’s measures with combinatorics, preprint 2016, arXiv:1508.06439v5 [math.DS].

2. [2] EL ABDALAOUI, E. H.—NADKARNI, M.: Some notes on flat polynomials, preprint 2014, http://arxiv.org/abs/1402.5457

3. [3] EL ABDALAOUI, E. H.—NADKARNI, M.: On flat polynomials with non-negative coefficients, preprint 2015, https://arxiv.org/abs/1508.00417

4. [4] BALISTER, P.—BOLLOBÁS, B.—MORRIS, R.—SAHASRABUDHE, J.—TIBA, M.: Flat Littlewood polynomials exist, arXiv:1907.09464v1 [math.CA].

5. [5] BECK, J.: Flat polynomials on the unit circle - Note on a Problem of Littlewood, Bull. London Math. Soc., 23 (1991), 269–277.

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