This correspondence is a critique of reference [1] (Cobelli and Romanin-Jacur, 1976). Properties equivalent to Complete Controllability (CC) in a structural sense and Complete Observability (CO) in a structural sense are presented. Deficiencies in their definition of structural identifiability are considered and alternate definitions to handle identifiability are provided. Finally a counterexample to the intended statement of Theorem 2.1 is presented.
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Zazworsky et al. (1977) studied this question.
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