Operators and Matrices · Volume 17, Issue 3 Invertible elements and commutativity in Banach algebras 17-38 Pages 573-581 DOI 10.7153/oam-2023-17-38 Downloads Short PDF Full PDF PNG Authors Cheikh Ould Hamoud Keywords Banach algebra invertible element commutativity spectral radius radical Subject classes 46H05 46H20