An analytic determination of the (A, B)-invariant and controllability subspaces
P. Fessas · International Journal of Control · 1979
The multicompanion controllable form of a multivariable system (A, B, C) is used to derive an algebraic description of the (A, B)-invariant and controllability subspaces of the system. The largest such subspaces in Ker (C) are also determined.