Operators and Matrices · Volume 6, Issue 4 Closed linear relations and their regular points 06-45 Pages 681-714 DOI 10.7153/oam-06-45 Downloads Short PDF Full PDF PNG Authors J.-Ph. Labrousse A. Sandovici H.S.V. De Snoo H. Winkler Keywords quasi-Fredholm relation ascent descent generalized resolvent gap metric range space Subject classes 47A57 47B25 47A55 47B65