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

Yemon Choi

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