Chebotarev's theorem for groups of order $pq$ and an uncertainty principle

Maria Loukaki

Let $p$ be a prime number and ${\zeta }_p$ a primitive $p$-th root of unity. Chebotarev's theorem states that every square submatrix of the $p\times p$ matrix $({\zeta }_p^{ij}{)}_{i,j=0}^{p-1}$…