Structure at inifinity of linear multivariable systems: A geometric approach
Christian Commault, Jean‐Michel Dion · IEEE Transactions on Automatic Control · 1982
The infinite zero structure of linear multivariable systems is investigated via the geometric approach. The basic tools used are the new concepts of almost (A, B)-invariant and almost controllability subspaces. These concepts permit advantageous geometric interpretation of infinite zeros. This interpretation is a natural generalization of the finite case. Connection is made with the Smith-McMillan structure at infinity of the transfer matrix.