Search for: [Subject and Keywords = positivity] OR [Subject and Keywords = Lyapunov systems] OR [Subject and Keywords = reachability] OR [Subject and Keywords = observability] OR [Title = Positive 2D discrete\-time linear Lyapunov systems] OR [Creator = Przyborowski, Przemysław] OR [Creator = Kaczorek, Tadeusz \(1932\- \)]