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Autor:
Christian LeMerdy
Publikováno v:
Semigroup Forum. 56:205-224
)t≥0 on a Hilbert space H, we establish conditions under which (Tt)t≥0 is similar to a contraction semigroup, i.e., there exists an isomorphism S E B (H) such that (S-1 Tt S)t≥0 is a contraction semigroup. In the case when the generator -A of (