Search for: [Abstract = "These conditions are a generalization for infinite\-dimensional retarded dynamical systems of the results derived recently for finite\-dimensional dynamical systems with delays. Moreover, some additional remarks and comments on the relationships between different concepts of controllability are given. Finally, as simple illustrative examples, the necessary and sufficient conditions for constrained approximate relative controllability with non\-negative controls for retarded distributed parameter parabolic\-type dynamical systems with one constant delay and with homogeneous Dirichlet boundary conditions are presented."]

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