Szukana fraza: [Abstract = "A generic structure of reachable and controllable positive linear systems is given in terms of some characteristic components \(monomial subdigraphs\) of the digraph of a non\-negative a pair. The properties of monomial subdigraphs are examined and used to derive reachability and controllability criteria in a digraph form for the general case when the system matrix A may contain zero columns."]

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