Operators and Matrices · Volume 14, Issue 4 Topological properties of the block numerical range of operator matrices 14-62 Pages 1001-1014 DOI 10.7153/oam-2020-14-62 Downloads Short PDF Full PDF PNG Authors Agnes Radl Manfred P. H. Wolff Keywords block numerical range numerical range spectrum resolvent Subject classes 47A10 47A12 47A75 47B65 15A60 46B08 46B42