Normal operators with highly incompatible off-diagonal corners

Laurent W. Marcoux, Heydar Radjavi, Yuanhang Zhang

Let $\mathcal{H}$ be a complex, separable Hilbert space, and $\mathcal{B}(\mathcal{H})$ denote the set of all bounded linear operators on $\mathcal{H}$. Given an orthogonal project…