Subnormal block Toeplitz operators

Mankunikuzhiyil Abhinand, Raul E. Curto, In Sung Hwang +2

In this paper we consider the subnormality of block Toeplitz operators $T_{\Phi }$, where $\Phi$ is an $n\times n$ matrix-valued function on the unit circle $\mathbb{T}$ of the form $$ Φ=QΦ^…