Abstract

In this paper the ability of feedback(state or output) for reforming dynamic systems is studied in a different point of view. A new concept called (A, B)-characteristic subspace is defined. (A, B)characteristic subspace is an (A, B)-invariant subspace and can be regarded as a generalization of characteristic subspace relative to matrix A. By means of the concept of (A, B)-ch.s., we work on the state and/or output feedback. In the last section of this paper, aome resulta concerning decentralized control systems are given.

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