System Regulation and Design, Geometric and Algebraic Methods in

Exosystem: A dynamical system modelling the set of all exogenous inputs (command/disturbances) affecting a controlled plant. Internal Model: A model of the exogenous inputs (command/disturbances) affecting a controlled plant, embedded in the interior of the controller. Generalized Tracking Problem: The problem of designing a controller able to asymptotically track/reject any exogenous command/disturbance in a fixed set of functions. Observer: A device designed to asymptotically track the state of a dynamical system on the basis of measured observations. Steady state: A family of behaviors, in a dynamical system, that are asymptotically approached, as actual time tends to infinity or as initial time tends to minus infinity.