What is a true spectra of a finite Fourier transform

Javier Diaz-Vargas, Lev Glebsky, Carlos Jacob Rubio-Barrios

In this paper we deal with a finite abelian group $G$ and the abstract Fourier transform ${\mathcal F}:{\mathbb C}^G\to {\mathbb C}^\hat{G}$. Then, we consider $\tilde{j}\circ {\ma…