# Ole Brevig: Helson matrices

C*-algebra seminar talk by Ole Brevig (University of Oslo)

The talk will be online, via zoom. Click this link to join.

Title: Helson matrices

Abstract: The infinite dimensional torus **T**^{∞} is a compact abelian group. Its dual is the group of positive rational numbers **Q**_{+}. Is there a function *ψ* ∈ L^{∞}(**T**^{∞}) with Fourier coefficients

\(\widehat{\psi}(n) = \frac{1}{\sqrt{n}\,\log{n}}\)

for *n*=2,3,4,...? The goal of my talk is to explain why this question is interesting.

Published Sep. 21, 2020 10:52 AM
- Last modified Oct. 2, 2020 1:45 PM