0
$\begingroup$

When does it occur that the eigenvalues of a Discrete Fourier Transform matrix are distinct?

1 Answers 1

2

The eigenvalues of the DFT matrix are treated here. They are distinct for $n<4$; for $n=4$ the eigenvalue $1$ is double and beginning with $n=9$ all four eigenvalues are multiple.

  • 0
    @user12290: It's all right there in the article I linked to.2011-07-03