Mohamed Barakat, Markus Lange-Hegermann (TU Kaiserslautern, RWTH-Aachen) barakat@mathematik.uni-kl.de markus.lange.hegermann@rwth-aachen.de filtration, etc. We use these properties in applications to algebraic system theory, an ongoing work with Q UADRAT and C LUZEAU. Building on this infrastructure the project supports ...