## Hahn-Banach type theorems for adjoint semigroups.(English)Zbl 0671.47035

It is shown that most of the Hahn-Banach theorems hold for the semigroup dual space $$X^{\odot}$$ of a $$C_ 0$$-semigroup on a Banach space X. As an application we give a new proof of a recently discovered characterization of $$\odot$$-reflexivity.

### MSC:

 47D03 Groups and semigroups of linear operators 46B10 Duality and reflexivity in normed linear and Banach spaces
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### References:

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