Positive Realness of a Transfer Function Neither Implies Nor is Implied by the External Positivity of their Associate Realizations

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/157406This letter discusses the differences between the properties of positive realness of transfer functions and external positivity in linear time-invariant dynamic systems. It is proved that each one of both properties does not imply to each other.5 pagesOptimization and ControlPositive Realness of a Transfer Function Neither Implies Nor is Implied by the External Positivity of their Associate Realizationstext