Operators and Matrices · Volume 6, Issue 1 When does the Moore-Penrose inverse flip? 06-13 Pages 181-192 DOI 10.7153/oam-06-13 Downloads Short PDF Full PDF PNG Authors R. E. Hartwig P. Patrício Keywords rings triangular matrices von Neumann regularity Moore-Penrose inverse Subject classes 15A09 16E50 16W10