Some equivalent conditions for exponential stabilization of linear systemswith unbounded control

It is proved that the equivalences among the exponential stabilizability of the control system, the existences of admissible controls for every initia l state condition and the solvability of some Riccati equation or some LQ p roblem also hold for the case in Hilbert space with unbounded control. The results do not need the compactness assumption for the resolvents of the in finitesimal generator, and improve the results available. They can be appli ed to the parabolic systems with boundary control through Dirichlet, Neuman n condition or pointwise control on not only bounded domain but also unboun ded domain.