Geodesic
Lifting the Commutant of a Subnormal Operator
Canadian journal of mathematics, Tome 31 (1979) no. 1, pp. 148-156

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

Let S be a subnormal operator on a Hilbert space H and let N be its minimal normal extension on the Hilbert space H. (We refer the reader to [5, 15] for the basic material on subnormal operators.) Denote the commutant and double commutant of an operator T by {T}’ and {T}”, respectively. 
Olin, Robert F.; Thomson, James E. Lifting the Commutant of a Subnormal Operator. Canadian journal of mathematics, Tome 31 (1979) no. 1, pp. 148-156. doi: 10.4153/CJM-1979-016-9
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