Operators and Matrices · Volume 10, Issue 3 The Birkhoff orthogonality in pre-Hilbert C∗-modules 10-44 Pages 713-729 DOI 10.7153/oam-10-44 Downloads Short PDF Full PDF PNG Authors Paweł Wójcik Keywords pre-Hilbert C✻-module continuous linear functional smoothness Subject classes 46B20 46L08 46L05