Abstract
We show that, whenA generates aC-semigroup, then there existsY such that [M(C)] →Y →X, andA| Y , the restriction ofA toY, generates a strongly continuous semigroup, where ↪ means “is continuously embedded in” and ‖x‖[Im(C)]≡‖C −1 x‖. There also existsW such that [C(W)] →X →W, and an operatorB such thatA=B| X andB generates a strongly continuous semigroup onW. If theC-semigroup is exponentially bounded, thenY andW may be chosen to be Banach spaces; in general,Y andW are Frechet spaces. If ρ(A) is nonempty, the converse is also true.
We construct fractional powers of generators of boundedC-semigroups.
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We would like to thank R. Bürger for sending preprints, and the referee for pointing out reference [37]. This research was supported by an Ohio University Research Grant.
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deLaubenfels, R. C-semigroups and strongly continuous semigroups. Israel J. Math. 81, 227–255 (1993). https://doi.org/10.1007/BF02761308
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DOI: https://doi.org/10.1007/BF02761308