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Minimization of the equation error is a well-known and powerful tool, which has been introduced to the reduction of time-invariant linear systems independently by Obinata and Inooka [1], [2] and by Eitelberg [3]-[5]. The purpose of this note is to examine critically the methods in [1], [2] and to propose to the readers of IEEE TRANSACTIONS ON AUTOMATIC CONTROL an altenative formalism, which has been tested successfully on systems of high order [3]-[5].
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E. Eitelberg (1982) studied this question.
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