Abstract
On montre que, pour chaque Co-groupe ρ d'isometries sur une C* algebre A, il correspond un Co-groupe α d'automorphismes sur A, et un cocycle unitaire u satisfaisant, ρ(t)a=u(t)α(t)a, t∈R, a∈A. On montre que le generateur de ρ est de la forme a→i(Ha−aK), ou H et K sont des operateurs auto-adjoints
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