Abstract

The generators of positive C 0- and C 0 ∗-semigroups on an ordered Banach space are characterized in case the positive cone is normal. The notion of dispersiveness is introduced and conditions are given in order that dispersiveness of the generator corresponds to positivity and contractivity of the semigroup. As an application an order-theoretic description of the generating derivations on a C ∗-algebra is given. Finally two distinct characterizations of the generators of strongly continuous unitary groups on a real Hilbert space keeping invariant a closed convex cone are given.

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