Geodesic
Subnormality and generalized commutation relations
Glasgow mathematical journal, Tome 30 (1988) no. 3, pp. 259-262

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

In the theory of Hilbert space operators an important question is whether an operator is subnormal [3], [4], [7], [8]. A densely defined linear operator S in a complex Hilbert space H is subnormal if there exists a normal operator N in a complex Hilbert space K ⊃ H such that S ⊂ N. 
Stochel, Jerzy Bartłomiej. Subnormality and generalized commutation relations. Glasgow mathematical journal, Tome 30 (1988) no. 3, pp. 259-262. doi: 10.1017/S0017089500007333
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