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Bibliographic Details
Main Author: Neuwirth, Stefan
Format: Preprint
Published: 2026
Subjects:
Online Access:https://arxiv.org/abs/2603.28229
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Table of Contents:
  • This constant is the maximum of the sum $|c_0|+|c_1|+|c_2|+|c_3|$ of the moduli of the coefficients of a trigonometric polynomial $c_0+c_1e^{it}+c_2e^{2it}+c_3e^{3it}$ bounded by 1. Its value is still unknown, but I will present some ideas on how to compute it and describe a distinguished torus of extremal functions.