On expansive operators that are quasisimilar to the unilateral shift of finite multiplicity

Maria F. Gamal'

An operator $T$ on a Hilbert space $\mathcal{H}$ is called expansive, if $\Vert Tx\Vert \ge \Vert x\Vert$ ($x\in \mathcal{H}$). Expansive operators $T$ quasisimilar to the unilateral shift $S_N$ of…