Operators and Matrices · Volume 8, Issue 3 Self-conjugate differential and difference operators arising in the optimal control of descriptor systems 08-36 Pages 659-682 DOI 10.7153/oam-08-36 Downloads Short PDF Full PDF PNG Authors Volker Mehrmann Lena Scholz Keywords differential-algebraic equation self-conjugate difference operator self-adjoint pair discrete-time optimal control necessary optimality condition congruence transformation higher order systems Subject classes 93C05 93C55 93C15 65L80 49K15 34H05