Operators and Matrices · Volume 15, Issue 3 Spherical symmetry of some unitary invariants for commuting tuples 15-70 Pages 1131-1139 DOI 10.7153/oam-2021-15-70 Downloads Short PDF Full PDF PNG Authors Sameer Chavan Kais Feki Keywords unitary invariants Taylor spectrum joint hyponormality Subject classes 47A13 47B20