Geodesic
Quasicyclic Subnormal Semigroups
Canadian journal of mathematics, Tome 29 (1977) no. 6, pp. 1230-1246

Voir la notice de l'article provenant de la source Cambridge University Press

Let T(s), s ≧ 0, be a strongly continuous semigroup of bounded operators on a separable Hilbert space . T(s) is said to be quasicyclic if there is a continuum of vectors such that T(s)xt = xs+t for all s, t > 0 and 
Frankfurt, Richard. Quasicyclic Subnormal Semigroups. Canadian journal of mathematics, Tome 29 (1977) no. 6, pp. 1230-1246. doi: 10.4153/CJM-1977-123-3
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