Operators and Matrices · Volume 1, Issue 1 Order reduction of discrete-time algebraic Riccati equations with singular closed loop matrix 01-04 Pages 61-70 DOI 10.7153/oam-01-04 Downloads Short PDF Full PDF PNG Authors Augusto Ferrante Harald K. Wimmer Keywords Discrete-time algebraic Riccati equation closed loop matrix symplectic matrix pencil deflating subspaces order reduction Subject classes 15A24 93C55 93B11