Reply to “Comments on `Strictly positive real transfer functions revisited´”

The authors wish to reassure the readers that the main result of the above paper, Lozano and Joshi (ibid., vol. 35, no. 11, p. 1243-45, 1990), i.e. Theorem 1, is not questioned in Marquez and Damaren (1995). The authors state that the commenters only question the validity of the proof of Lemma 1, which was a side result and not the main purpose of the paper. The authors agree that the commenters have a valid point which was overlooked in their proof of Lemma 1.3. The authors maintain, however, that Lemma 1 is valid at least in the finite dimensional linear time-invariant (LTI) case, which is the class of systems for which Theorem 1 is applicable