We provide some conditions for operator matrices whose diagonal entries are -hyponormal operators to be subscalar. As a consequence, we obtain that Weyl type theorem holds for such operator matrices.
Fei Zuo. Junli Shen. "On Subscalarity of Some 2 × 2 M-Hyponormal Operator Matrices." Abstr. Appl. Anal. 2014 (SI43) 1 - 7, 2014. https://doi.org/10.1155/2014/461567