Unitary similarity invariant function preservers of skew products of operators

Jianlian Cui, Chi-Kwong Li, Nung-Sing Sze

Let $\mathcal{B}(H)$ denote the Banach algebra of all bounded linear operators on a complex Hilbert space $H$ with $\dim H\ge 3$, and let $\mathcal{A}$ and $\mathcal{B}$ be subsets…