Séminaires : Séminaire d'Analyse Fonctionnelle

 Equipe(s) : af, Responsables : E. Abakoumov - D. Cordero-Erausquin - G. Godefroy - O. Guédon - B. Maurey - G.Pisier Email des responsables : Salle : salle 13 - couloir 15-16 - 4ème étage Adresse : Campus Pierre et Marie Curie Description Le Jeudi à 10h30 -  IMJ-PRG - 4 place Jussieu - 75005 PARIS Lien vers les archives des années antérieures à 2015

 Orateur(s) Yuri Belov - St. Petersbourg, Titre Density of complete and minimal systems of time frequency shifts of Gaussians Date 14/11/2019 Horaire 10:30 à 12:00 Résume It was shown by Ascenzi, Lyubarskii, Seip that the upper density of any complete and minimal system of Gaussians is between $\frac{2}{\pi}$ and 1, if we know that there exists an angular density. It was an open question whether it is true in general. We will show that there exists a complete and minimal system with upper density $\frac{1}{\pi}$, and that the upper density of any such system is larger than $\frac{1}{3\pi}$. The talk is based on work in collaboration with A. Borichev and A. Kuznetsov. Salle salle 13 - couloir 15-16 - 4ème étage Adresse Campus Pierre et Marie Curie
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