Lower bounds by birkhoff interpolation
- IGNACIO GARCÍA-MARCO
- PASCAL KOIRAN
ISSN: 1132-6360
Année de publication: 2018
Titre de la publication: Proceedings of the XVI EACA Zaragoza Encuentros de Algebra Computacional y Aplicaciones
Número: 43
Pages: 95-98
Type: Article
D'autres publications dans: Monografías de la Real Academia de Ciencias Exactas, Físicas, Químicas y Naturales de Zaragoza
Résumé
In this work we give lower bounds for the representation of real univariate polynomials as sums of powers of degree 1 polynomials. We present two families of polynomials of degree d such that the number of powers that are required in such a representation must be at least of order d. This is clearly optimal up to a constant factor. Previous lower bounds for this problem were only of order Ω(√ d), and were obtained from arguments based on Wronskian determinants and "shifted derivatives". We obtain this improvement thanks to a new lower bound method based on Birkhoff interpolation.