3 problems

Harmonic-frame optimality conjecture. If $m\geq 4$ is even, then

Let $N$ be prime, let $\mathbb{A}_N^d$ denote the parameter space of harmonic frames, and let $\mathcal{O}_{[n]}$ be an orbit of $\mathbb{A}_N^d$ such that … Let $\Phi_n$ be the ha…

Let $N$ and $d$ be the parameters of a harmonic frame, and consider harmonic frames equivalent when one is obtained from the other by a unitary transformation. Waldron's growth con…