抄録
A lower left triangular interactor has been used in the multivariable control systems. But, since the triangular form is not essential for a polynomial matrix to be an interactor, we focus our attention on the more general class of interactor and its properties in this paper. It will be shown that this general class of interactors and the state equation of the inverted interactorized closed loop system are invariant under a state feedback. The relationship between these invariant properties and the maximally unobservable subspace of the feedback system will be also discussed.
