Operators and Matrices · Volume 1, Issue 1 Weak contractions and trace class perturbations 01-05 Pages 71-85 DOI 10.7153/oam-01-05 Downloads Short PDF Full PDF PNG Authors Hari Bercovici Dan Timotin Keywords Weak contraction perturbation trace class characteristic function functional calculus Subject classes 47L45 47A45 47A55 47B10