Operators and Matrices · Volume 5, Issue 3 On 2×2 operator matrices 05-26 Pages 365-388 DOI 10.7153/oam-05-26 Downloads Short PDF Full PDF PNG Authors Sungeun Jung Yoenha Kim Eungil Ko Keywords subscalar operators the property (β) 2-hyponormal operators invariant subspaces Subject classes 47A11 47A15 47B20