Séminaires : Séminaire d'Analyse Fonctionnelle

Equipe(s) : af,
Responsables :E. Abakoumov - A.Eskenazis - D. Cordero-Erausquin - M. Fathi - O. Guédon - B. Maurey
Email des responsables :
Salle : salle 13 - couloir 15-16 - 4ème étage
Adresse :Campus Pierre et Marie Curie
Le Jeudi à 10h30 -  IMJ-PRG - 4 place Jussieu - 75005 PARIS

Orateur(s) Yuri Belov - St. Petersbourg,
Titre Density of complete and minimal systems of time frequency shifts of Gaussians
Horaire10:30 à 12:00

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.

Sallesalle 13 - couloir 15-16 - 4ème étage
AdresseCampus Pierre et Marie Curie