2 papers
math.FA2019
Minimal passive realizations of generalized Schur functions in Pontryagin spaces
Lassi Lilleberg
Passive discrete-time systems in Pontryagin space setting are investigated. In this case the transfer functions of passive systems, or characteristic functions of contractive opera…
math.FA2019
Passive discrete-time systems with a Pontryagin state space
Lassi Lilleberg
Passive discrete-time systems with Hilbert spaces as an incoming and outgoing space and a Pontryagin space as a state space are investigated. A geometric characterization when the…