Operators and Matrices · Volume 11, Issue 2 The spectral equality for upper triangular operator matrices with unbounded entries 11-33 Pages 505-517 DOI 10.7153/oam-11-33 Downloads Short PDF Full PDF PNG Authors Deyu Wu Alatancang Chen Tin-Yau Tam Keywords spectral equality upper triangular operator matrices null space Subject classes 47B47 47A10