Which topic(s) does this matrix come from? What is the name of this matrix?
$$\pmatrix{1&1&1\\1&\omega&\omega^2\\1&\omega^2&\omega}$$
Which topic(s) does this matrix come from? What is the name of this matrix?
$$\pmatrix{1&1&1\\1&\omega&\omega^2\\1&\omega^2&\omega}$$