MacDonald, GordonMastnak, MitjaOmladic, MatjazRadjavi, Heydar2024-01-312024-01-312021https://doi.org/10.7153/oam-2021-15-03http://hdl.handle.net/10012/20323We characterize those unital, self-adjoint algebras of complex n x n matrices that are simultaneously unitarily similar to algebras in which every member has a scalar diagonal.enunitary similarityscalar diagonalsself-adjoint subalgebras of matricesArticle