Yemon Choi

collaborators

3 papers

math.FA2026

On amenability constants of Fourier algebras: new bounds and new examples

Yemon Choi, Mahya Ghandehari

Let $G$ be a locally compact group. If $G$ is finite then the amenability constant of its Fourier algebra, denoted by $AM (A (G))$ , admits an explicit formula [Johnson, J…

math.GR2024

Small values and forbidden values for the Fourier antidiagonal constant of a finite group

Yemon Choi

For a finite group $G$ , let $AD (G)$ denote the Fourier norm of the antidiagonal in $G \times G$ . It was shown recently by the author (IMRN, 2023) that $AD (G)$ coincides…

math.FA2024

Constructing non-AMNM weighted convolution algebras for every semilattice of infinite breadth

Yemon Choi, Mahya Ghandehari, Hung Le Pham

The AMNM property for commutative Banach algebras is a form of Ulam stability for multiplicative linear functionals. We show that on any semilattice of infinite breadth, one may co…