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    • Invariance Properties of Time-Varying Linear Systems 

      Păstrăvanu, Octavian; Matcovschi, Mihaela ("Dunarea de Jos" University of Galati, 2007)
      This paper formulates and proves two types of necessary and sufficient conditions for the characterization of positively (flow) invariant sets with respect to the state-space trajectories of the time-varying (non-autonomous) ...